[
  {
    "sku": "NN4932",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4932",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 395,
    "static_load_kN": 740,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 6240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4932 appears as a 160 mm bore single-row cylindrical roller bearing (395 kN C / 740 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN4932 to its envelope: type code NN, series NN4900, 160 mm bore; the 220×60 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 178.5 mm and Ew 206.5169 mm — the envelope inside the 160/220 mm bore/OD where the rollers actually run. Mass 6240 g for the 160×220×60 mm NN4932 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 6240 g NN4932 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 220×60 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 220 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 395/740 kN pair here belongs to NN4932 as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 220×60 mm envelope matches.",
      "The 395/740 kN ratings, 74 kN Pu and 6240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4932 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4932?",
        "a": "NN4932 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 60 mm width (6.299 × 8.661 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 740 kN, Pu 74 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 6240 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4932 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4932 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4932?",
        "a": "NN4932 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4932?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 178.5 mm, Ew 206.5169 mm. The nominal bore/OD remain 160/220 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4932",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4932",
      "NN4932"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4932K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4932K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 395,
    "static_load_kN": 740,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 5940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN4932K on the 160×220 mm envelope, 60 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,600 r/min. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4932K floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NN4932K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 160 mm (6.299 in) bore and 220 mm (8.661 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 60 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 5940 g NN4932K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4932K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NN4932K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 220×60 mm envelope matches.",
      "Do not replace NN4932K with a deep-groove ball bearing on rating alone: line contact gives 395 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 395/740 kN ratings, 74 kN Pu and 5940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4932K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4932K?",
        "a": "NN4932K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 60 mm width (6.299 × 8.661 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 740 kN, Pu 74 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 5940 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4932K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4932K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4932K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4932K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4932 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4932K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 178.5 mm, Ew 206.5169 mm. The nominal bore/OD remain 160/220 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4932K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4932k",
      "NN4932K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4932K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4932K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 395,
    "static_load_kN": 740,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3100,
    "weight_g": 6230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4932K is the extra-light (10/49) section of the NTN NNU4900 dimension series for a 160 mm shaft — 395 kN of basic dynamic capacity in a 6230 g, open bearing. Digit by digit, NNU4932K reads as NNU (double row, ribbed outer ring, separable inner), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,100 r/min with oil versus 2,600 r/min with grease (a 500 r/min band), lubrication choice for NNU4932K is a thermal decision, not just a sealing one. Rating life at 395 kN C assumes clean oil and adequate film; the 74 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NNU4932K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,100 r/min need positive flow and drain design; the 6230 g NNU4932K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 30.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 60 mm-wide cavity.",
      "The K tapered bore of NNU4932K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Grease limiting speed 2,600 r/min and oil 3,100 r/min are different limits for NNU4932K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 395/740 kN ratings, 74 kN Pu and 6230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4932K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4932K?",
        "a": "NNU4932K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 60 mm width (6.299 × 8.661 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 395 kN, C0 740 kN, Pu 74 kN, grease limiting speed 2,600 r/min, oil 3,100 r/min, mass about 6230 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4932K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4932K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4932K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4932K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4932 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4932K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 178.5 mm, Ew 206.5169 mm. The nominal bore/OD remain 160/220 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4932K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4932k",
      "NNU4932K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1032",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1032 is the extra-light (10/49) section of the NTN N1000 dimension series for a 160 mm shaft — 263 kN of basic dynamic capacity in a 5810 g, open bearing. Digit by digit, N1032 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 220 mm — the envelope inside the 160/240 mm bore/OD where the rollers actually run. The 1.6 kN-per-mm-bore figure (263 kN over 160 mm) lets a N1032 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g N1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,800 r/min and oil 3,300 r/min are different limits for N1032: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "The N rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 240×38 mm envelope matches.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1032?",
        "a": "N1032 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1032 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1032 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1032",
      "N1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1032",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1032 appears as a 160 mm bore single-row cylindrical roller bearing (263 kN C / 340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 160 mm (6.299 in) bore and 240 mm (9.449 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 38 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g NJ1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/340 kN pair here belongs to NJ1032 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/340 kN pair here belongs to NJ1032 as printed, not to the bare size.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1032?",
        "a": "NJ1032 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1032 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1032 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1032",
      "NJ1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3032",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 415,
    "static_load_kN": 660,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 8920,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NN3032: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,500 r/min on grease and 2,900 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 240 mm OD and 60 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 40.0 mm radial section between the 160 mm bore and 240 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Selection arithmetic: Pu 65.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.59 (660/415 kN) shows the high-static-capacity proportioning of this 160 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3032.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 8920 g NN3032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3032 with a deep-groove ball bearing on rating alone: line contact gives 415 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 415/660 kN pair here belongs to NN3032 as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 160 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 240×60 mm envelope matches.",
      "The 415/660 kN ratings, 65.5 kN Pu and 8920 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3032?",
        "a": "NN3032 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 415 kN, C0 660 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 8920 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3032 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3032?",
        "a": "NN3032 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3032?",
        "a": "NTN rates NN3032 at 2,500 r/min with grease and 2,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3032",
      "NN3032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3032K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3032K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 415,
    "static_load_kN": 660,
    "fatigue_load_limit_kN": 65.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 8590,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3032K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 160×240×60 mm ISO 15 envelope. Numbering ties NN3032K to its envelope: type code NN, series NN3000, 160 mm bore; the 240×60 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 8590 g NN3032K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3032K with a deep-groove ball bearing on rating alone: line contact gives 415 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 240 mm race brinells and releases as vibration within hours.",
      "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 415/660 kN ratings, 65.5 kN Pu and 8590 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3032K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3032K?",
        "a": "NN3032K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 415 kN, C0 660 kN, Pu 65.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 8590 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3032K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3032K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3032K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3032K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3032 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3032K?",
        "a": "NTN rates NN3032K at 2,500 r/min with grease and 2,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3032K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3032k",
      "NN3032K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1032",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NU1032: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,800 r/min on grease and 3,300 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 240 mm OD and 38 mm width from the ISO 15 general plan. With C 263 kN and C0 340 kN (C0/C ≈ 1.29) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Thermal planning around the 2,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 3,300 r/min for continuously high-duty 160 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1032.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g NU1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 38 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1032 skids at 2,800 r/min and fails by smearing long before L10 fatigue.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1032?",
        "a": "NU1032 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1032 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1032 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1032-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×240×38 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1032",
      "NU1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1032",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1032",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 38,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 263,
    "static_load_kN": 340,
    "fatigue_load_limit_kN": 34,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3300,
    "weight_g": 5810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NUP1032: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,800 r/min on grease and 3,300 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 240 mm OD and 38 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 180 mm and Ew 220 mm — the envelope inside the 160/240 mm bore/OD where the rollers actually run. Equivalent-load planning treats NUP1032 as a pure radial bearing: keep P below 263 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP1032; an oversized radius locks the ring on its face and tilts the 38 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 3,300 r/min need positive flow and drain design; the 5810 g NUP1032 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 38 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 263/340 kN pair here belongs to NUP1032 as printed, not to the bare size.",
      "Open NUP1032 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 240×38 mm envelope matches.",
      "The 263/340 kN ratings, 34 kN Pu and 5810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1032 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1032?",
        "a": "NUP1032 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 38 mm width (6.299 × 9.449 × 1.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 263 kN, C0 340 kN, Pu 34 kN, grease limiting speed 2,800 r/min, oil 3,300 r/min, mass about 5810 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1032 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1032 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1032 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1032?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 180 mm, Ew 220 mm. The nominal bore/OD remain 160/240 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,800 r/min grease / 3,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1032",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1032",
      "NUP1032"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2232",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N2232 denotes a 160×290×80 mm (6.299 × 11.417 × 3.15 in) cylindrical roller bearing in the N2200 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N2232 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2232 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 4.4 kN-per-mm-bore figure (700 kN over 160 mm) lets a N2232 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g N2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N2232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "If the shaft must be located both ways, do not use N2232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open N2232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2232?",
        "a": "N2232 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2232 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2232 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2232",
      "N2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N232",
    "brand": "NTN",
    "manufacturer_designation": "NTN N232",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies N232: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,300 r/min on grease and 2,700 r/min on oil. Digit by digit, N232 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N232. Mass 13400 g for the 160×290×48 mm N232 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 160 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g N232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 475/570 kN pair here belongs to N232 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use N232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N232?",
        "a": "N232 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N232 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N232 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n232",
      "N232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF232",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF232 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 160×290×48 mm ISO 15 envelope. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. With C 475 kN and C0 570 kN (C0/C ≈ 1.20) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NF arrangements. On NF arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NF232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NF232 with a deep-groove ball bearing on rating alone: line contact gives 475 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 160 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 290×48 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF232?",
        "a": "NF232 is an NTN NF single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF232 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF232 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf232",
      "NF232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2232",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2232 is the wide (22) section of the NTN NJ2200 dimension series for a 160 mm shaft — 700 kN of basic dynamic capacity in a 21600 g, open bearing. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 80 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2232. Rating life at 700 kN C assumes clean oil and adequate film; the 90 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g NJ2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2232 skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2232?",
        "a": "NJ2232 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2232 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2232 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2232-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2232",
      "NJ2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2232E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 895,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 114,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2232E denotes a 160×290×80 mm (6.299 × 11.417 × 3.15 in) cylindrical roller bearing in the NJ2200 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NJ2232E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 895 kN and C0 1190 kN (C0/C ≈ 1.33) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 160 mm (6.299 in) bore and 290 mm (11.417 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NJ2232E; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NJ2232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NJ2232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 895/1190 kN pair here belongs to NJ2232E as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ2232E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2232E skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "The 895/1190 kN ratings, 114 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2232E?",
        "a": "NJ2232E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 895 kN, C0 1190 kN, Pu 114 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2232E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2232E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2232e",
      "NJ2232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ232",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ232 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 475 kN dynamic rating in the 160 mm bore. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ232. Mass 13400 g for the 160×290×48 mm NJ232 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NJ232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 475/570 kN pair here belongs to NJ232 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ232?",
        "a": "NJ232 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ232 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ232 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ232-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj232",
      "NJ232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ232E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ232E is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 160×290×48 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NJ232E designation when purchasing. Equivalent-load planning treats NJ232E as a pure radial bearing: keep P below 555 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NJ232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ232E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ232E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 555/665 kN ratings, 63.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ232E?",
        "a": "NJ232E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 665 kN, Pu 63.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ232E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ232E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj232e",
      "NJ232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2232",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2232 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 700 kN dynamic rating in the 160 mm bore. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). The 80 mm width and 65.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 160 mm (6.299 in) bore and 290 mm (11.417 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2232 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g NU2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 160 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "If the shaft must be located both ways, do not use NU2232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NU2232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NU2232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2232?",
        "a": "NU2232 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2232 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2232 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2232-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2232",
      "NU2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2232E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 895,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 114,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2232E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 895 kN dynamic rating in the 160 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2232E floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. At 2,200 r/min with oil versus 1,900 r/min with grease (a 300 r/min band), lubrication choice for NU2232E is a thermal decision, not just a sealing one. Selection arithmetic: Pu 114 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.33 (1190/895 kN) shows the high-static-capacity proportioning of this 160 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2232E.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NU2232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 895/1190 kN pair here belongs to NU2232E as printed, not to the bare size.",
      "Do not replace NU2232E with a deep-groove ball bearing on rating alone: line contact gives 895 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NU2232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NU2232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 895/1190 kN ratings, 114 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2232E?",
        "a": "NU2232E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 895 kN, C0 1190 kN, Pu 114 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2232E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2232E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2232e",
      "NU2232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU232",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU232 denotes a 160×290×48 mm (6.299 × 11.417 × 1.89 in) cylindrical roller bearing in the NU200 family, a pressed sheet-steel cage. Numbering ties NU232 to its envelope: type code NU, series NU200, 160 mm bore; the 290×48 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU232 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 54.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.20 (570/475 kN) shows the high-static-capacity proportioning of this 160 mm bore. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NU232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "If the shaft must be located both ways, do not use NU232 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NU232 with a deep-groove ball bearing on rating alone: line contact gives 475 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU232?",
        "a": "NU232 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU232 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU232 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU232-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu232",
      "NU232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU232E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU232E is the standard section of the NTN NU200 dimension series for a 160 mm shaft — 555 kN of basic dynamic capacity in a open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU232E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 555 kN C assumes clean oil and adequate film; the 63.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU232E.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NU232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU232E with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU232E skids at 2,100 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NU232E with a deep-groove ball bearing on rating alone: line contact gives 555 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 555/665 kN ratings, 63.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU232E?",
        "a": "NU232E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 665 kN, Pu 63.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU232E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU232E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu232e",
      "NU232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2232",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 700,
    "static_load_kN": 940,
    "fatigue_load_limit_kN": 90,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2232 appears as a 160 mm bore single-row cylindrical roller bearing (700 kN C / 940 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 195 mm and Ew 255 mm — the envelope inside the 160/290 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2232 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 21600 g NUP2232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 2,100 r/min and oil 2,400 r/min are different limits for NUP2232: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "The 700/940 kN ratings, 90 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2232?",
        "a": "NUP2232 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 700 kN, C0 940 kN, Pu 90 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 21600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2232 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2232 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2232",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2232",
      "NUP2232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2232E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 895,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 114,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2232E on the 160×290 mm envelope, 80 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,900 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). With C 895 kN and C0 1190 kN (C0/C ≈ 1.33) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Housing and shaft fillets must clear the ring chamfers of NUP2232E; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NUP2232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2232E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "Do not replace NUP2232E with a deep-groove ball bearing on rating alone: line contact gives 895 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 290×80 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2232E skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "The 895/1190 kN ratings, 114 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2232E?",
        "a": "NUP2232E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 895 kN, C0 1190 kN, Pu 114 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2232E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2232E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2232e",
      "NUP2232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP232",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP232",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 475,
    "static_load_kN": 570,
    "fatigue_load_limit_kN": 54.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP232 on the 160×290 mm envelope, 48 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,300 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP232 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP232 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP232.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 13400 g NUP232 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP232 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP232 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The 48 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 475/570 kN ratings, 54.5 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP232 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP232?",
        "a": "NUP232 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 475 kN, C0 570 kN, Pu 54.5 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 13400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP232 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP232 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP232 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP232?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm, Ew 255 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP232-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×290×48 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup232",
      "NUP232"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP232E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP232E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 665,
    "fatigue_load_limit_kN": 63.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP232E denotes a 160×290×48 mm (6.299 × 11.417 × 1.89 in) cylindrical roller bearing in the NUP200 family, the high-capacity pressed-steel cage of the E execution. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 290 mm OD and 48 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP232E. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the NUP232E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 65.0 mm section at 160 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 48 mm-wide cavity.",
      "Grease limiting speed 2,100 r/min and oil 2,400 r/min are different limits for NUP232E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 555/665 kN ratings, 63.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP232E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP232E?",
        "a": "NUP232E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 48 mm width (6.299 × 11.417 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 665 kN, Pu 63.5 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP232E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP232E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP232E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP232E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 195 mm. The nominal bore/OD remain 160/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP232E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup232e",
      "NUP232E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2332",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2332 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 160×340×114 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2332 designation when purchasing. Speed ratio check: limiting 1,700 r/min is .85 of the 2,000 r/min oil value for N2332; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 160 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g N2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N2332 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1190/1520 kN pair here belongs to N2332 as printed, not to the bare size.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N2332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 114 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2332?",
        "a": "N2332 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2332 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2332 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2332",
      "N2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N332",
    "brand": "NTN",
    "manufacturer_designation": "NTN N332",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N332 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 775 kN dynamic rating in the 160 mm bore. Numbering ties N332 to its envelope: type code N, series N300, 160 mm bore; the 340×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 775 kN and C0 875 kN (C0/C ≈ 1.13) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. The 4.8 kN-per-mm-bore figure (775 kN over 160 mm) lets a N332 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g N332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace N332 with a deep-groove ball bearing on rating alone: line contact gives 775 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The N rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×68 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N332 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N332?",
        "a": "N332 is an NTN N single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N332 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N332 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n332",
      "N332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF332",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NF332 on the 160×340 mm envelope, 68 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF332 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 2,000 r/min is .87 of the 2,300 r/min oil value for NF332; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NF332; an oversized radius locks the ring on its face and tilts the 68 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NF332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NF332 as printed, not to the bare size.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NF332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NF332 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NF332 as printed, not to the bare size.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF332?",
        "a": "NF332 is an NTN NF single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF332 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF332 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf332",
      "NF332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2332",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2332 denotes a 160×340×114 mm (6.299 × 13.386 × 4.488 in) cylindrical roller bearing in the NJ2300 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2332 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. With C 1190 kN and C0 1520 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,000 r/min for continuously high-duty 160 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2332.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g NJ2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2332 skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2332?",
        "a": "NJ2332 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2332 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2332 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×114 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2332",
      "NJ2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2332E",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 1820,
    "fatigue_load_limit_kN": 168,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2332E is the extra-wide (23) section of the NTN NJ2300 dimension series for a 160 mm shaft — 1460 kN of basic dynamic capacity in a open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 204 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,900 r/min for continuously high-duty 160 mm positions. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NJ2332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 114 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 114 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "The 1460/1820 kN ratings, 168 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2332E?",
        "a": "NJ2332E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 1820 kN, Pu 168 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2332E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2332E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2332e",
      "NJ2332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ332",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ332 appears as a 160 mm bore single-row cylindrical roller bearing (775 kN C / 875 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 160 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NJ332 as a pure radial bearing: keep P below 775 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NJ332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NJ332 as printed, not to the bare size.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ332?",
        "a": "NJ332 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ332 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ332 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj332",
      "NJ332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ332E",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 97.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ332E denotes a 160×340×68 mm (6.299 × 13.386 × 2.677 in) cylindrical roller bearing in the NJ300 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ332E floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ332E. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,100 r/min for continuously high-duty 160 mm positions. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NJ332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ332E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "Grease limiting speed 1,800 r/min and oil 2,100 r/min are different limits for NJ332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 950/1050 kN ratings, 97.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ332E?",
        "a": "NJ332E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1050 kN, Pu 97.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ332E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ332E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj332e",
      "NJ332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2332",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2332 appears as a 160 mm bore single-row cylindrical roller bearing (1190 kN C / 1520 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NU2332 to its envelope: type code NU, series NU2300, 160 mm bore; the 340×114 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2332. Mass 49500 g for the 160×340×114 mm NU2332 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2332 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g NU2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1190/1520 kN pair here belongs to NU2332 as printed, not to the bare size.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2332?",
        "a": "NU2332 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2332 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2332 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×114 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2332",
      "NU2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2332E",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 1820,
    "fatigue_load_limit_kN": 168,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NU2332E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 160 mm, with 340 mm OD and 114 mm width from the ISO 15 general plan. With C 1460 kN and C0 1820 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. The 9.1 kN-per-mm-bore figure (1460 kN over 160 mm) lets a NU2332E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NU2332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU2332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2332E skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 1460/1820 kN ratings, 168 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2332E?",
        "a": "NU2332E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 1820 kN, Pu 168 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2332E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2332E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2332e",
      "NU2332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU332",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU332 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 160×340×68 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU332 floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 208 mm and Ew 292 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. Speed ratio check: limiting 2,000 r/min is .87 of the 2,300 r/min oil value for NU332; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 160 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NU332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 68 mm-wide cavity.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 160 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×68 mm envelope matches.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU332?",
        "a": "NU332 is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU332 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU332 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU332-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 160×340×68 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu332",
      "NU332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU332E",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 97.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU332E appears as a 160 mm bore single-row cylindrical roller bearing (950 kN C / 1050 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NU332E to its envelope: type code NU, series NU300, 160 mm bore; the 340×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 68 mm width and 90.0 mm section put the NU300 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 97.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.11 (1050/950 kN) shows the high-static-capacity proportioning of this 160 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NU332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU332E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,800 r/min and oil 2,100 r/min are different limits for NU332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 68 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 160 mm inner ring.",
      "Open NU332E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 160 mm contact.",
      "The 950/1050 kN ratings, 97.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU332E?",
        "a": "NU332E is an NTN NU single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1050 kN, Pu 97.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU332E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU332E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu332e",
      "NU332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2332",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1520,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2332 is the extra-wide (23) section of the NTN NUP2300 dimension series for a 160 mm shaft — 1190 kN of basic dynamic capacity in a 49500 g, open bearing. Numbering ties NUP2332 to its envelope: type code NUP, series NUP2300, 160 mm bore; the 340×114 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for NUP2332 is a thermal decision, not just a sealing one. The 160 mm (6.299 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 114 mm-wide ring. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 49500 g NUP2332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90.0 mm section at 160 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 114 mm-wide cavity.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 160 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NUP2332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1190/1520 kN ratings, 141 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2332?",
        "a": "NUP2332 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1520 kN, Pu 141 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 49500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2332 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2332 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2332",
      "NUP2332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2332E",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 1820,
    "fatigue_load_limit_kN": 168,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2332E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 160×340×114 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2332E floats or locates; the numeric remainder is the ISO 15 series and 160 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 204 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. Equivalent-load planning treats NUP2332E as a pure radial bearing: keep P below 1460 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 160 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NUP2332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NUP2332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NUP2332E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NUP2332E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×114 mm envelope matches.",
      "The 1460/1820 kN ratings, 168 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2332E?",
        "a": "NUP2332E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 1820 kN, Pu 168 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2332E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2332E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2332e",
      "NUP2332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP332",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP332",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 775,
    "static_load_kN": 875,
    "fatigue_load_limit_kN": 81,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 30600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 160 mm shaft NTN supplies NUP332: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,000 r/min on grease and 2,300 r/min on oil. Digit by digit, NUP332 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 160 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,300 r/min with oil versus 2,000 r/min with grease (a 300 r/min band), lubrication choice for NUP332 is a thermal decision, not just a sealing one. Rating life at 775 kN C assumes clean oil and adequate film; the 81 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP332.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 30600 g NUP332 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 775/875 kN pair here belongs to NUP332 as printed, not to the bare size.",
      "Do not replace NUP332 with a deep-groove ball bearing on rating alone: line contact gives 775 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP332: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 775/875 kN ratings, 81 kN Pu and 30600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP332 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP332?",
        "a": "NUP332 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 775 kN, C0 875 kN, Pu 81 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 30600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP332 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP332 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP332 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP332?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 292 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP332",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup332",
      "NUP332"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP332E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP332E",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 97.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP332E is the standard section of the NTN NUP300 dimension series for a 160 mm shaft — 950 kN of basic dynamic capacity in a open bearing. Numbering ties NUP332E to its envelope: type code NUP, series NUP300, 160 mm bore; the 340×68 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 204 mm — the envelope inside the 160/340 mm bore/OD where the rollers actually run. The 160 mm (6.299 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 68 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 160 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 160 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NUP332E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP332E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 950/1050 kN pair here belongs to NUP332E as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 160 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×68 mm envelope matches.",
      "The 950/1050 kN ratings, 97.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP332E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP332E?",
        "a": "NUP332E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 68 mm width (6.299 × 13.386 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1050 kN, Pu 97.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP332E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP332E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP332E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP332E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 204 mm. The nominal bore/OD remain 160/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP332E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=152",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup332e",
      "NUP332E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4934",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4934",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 75.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 6560,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4934 is the extra-light (10/49) section of the NTN NN4900 dimension series for a 170 mm shaft — 400 kN of basic dynamic capacity in a 6560 g, open bearing. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 230 mm OD and 60 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN4934. The 170 mm (6.693 in) bore and 230 mm (9.055 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 60 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 170 mm shaft.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 6560 g NN4934 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4934 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Grease limiting speed 2,500 r/min and oil 2,900 r/min are different limits for NN4934: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN4934 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 230 mm race brinells and releases as vibration within hours.",
      "The 400/765 kN ratings, 75.5 kN Pu and 6560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4934 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4934?",
        "a": "NN4934 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 60 mm width (6.693 × 9.055 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 400 kN, C0 765 kN, Pu 75.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 6560 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4934 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4934 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4934?",
        "a": "NN4934 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4934?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 188.5 mm, Ew 216.5179 mm. The nominal bore/OD remain 170/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4934",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4934",
      "NN4934"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4934K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4934K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 75.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 6240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4934K appears as a 170 mm bore single-row cylindrical roller bearing (400 kN C / 765 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Digit by digit, NN4934K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NN4934K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 2,500 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 2,900 r/min for continuously high-duty 170 mm positions. Housing and shaft fillets must clear the ring chamfers of NN4934K; an oversized radius locks the ring on its face and tilts the 60 mm-wide seat.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 6240 g NN4934K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NN4934K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Do not replace NN4934K with a deep-groove ball bearing on rating alone: line contact gives 400 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The K tapered bore of NN4934K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 400/765 kN ratings, 75.5 kN Pu and 6240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4934K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4934K?",
        "a": "NN4934K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 60 mm width (6.693 × 9.055 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 400 kN, C0 765 kN, Pu 75.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 6240 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4934K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4934K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4934K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4934K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4934 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4934K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 188.5 mm, Ew 216.5179 mm. The nominal bore/OD remain 170/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4934K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4934k",
      "NN4934K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4934K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4934K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 400,
    "static_load_kN": 765,
    "fatigue_load_limit_kN": 75.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 2900,
    "weight_g": 6550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NNU4934K on the 170×230 mm envelope, 60 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,500 r/min. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 230 mm OD and 60 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 188.5 mm and Ew 216.5179 mm — the envelope inside the 170/230 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 75.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.91 (765/400 kN) shows the high-static-capacity proportioning of this 170 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 170 mm shaft.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 6550 g NNU4934K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 230×60 mm envelope matches.",
      "The 60 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 230×60 mm envelope matches.",
      "The 400/765 kN ratings, 75.5 kN Pu and 6550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4934K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4934K?",
        "a": "NNU4934K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 60 mm width (6.693 × 9.055 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 400 kN, C0 765 kN, Pu 75.5 kN, grease limiting speed 2,500 r/min, oil 2,900 r/min, mass about 6550 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4934K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4934K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4934K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4934K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4934 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4934K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 188.5 mm, Ew 216.5179 mm. The nominal bore/OD remain 170/230 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,500 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4934K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4934k",
      "NNU4934K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1034",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N1034 denotes a 170×260×42 mm (6.693 × 10.236 × 1.654 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Numbering ties N1034 to its envelope: type code N, series N1000, 170 mm bore; the 260×42 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N1034. Rating life at 310 kN C assumes clean oil and adequate film; the 38.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1034.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g N1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N1034 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "Grease limiting speed 2,600 r/min and oil 3,000 r/min are different limits for N1034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1034?",
        "a": "N1034 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1034 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1034 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1034",
      "N1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1034",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1034 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 170 mm shaft — 310 kN of basic dynamic capacity in a 7760 g, open bearing. Digit by digit, NJ1034 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 3,000 r/min with oil versus 2,600 r/min with grease (a 400 r/min band), lubrication choice for NJ1034 is a thermal decision, not just a sealing one. The 1.8 kN-per-mm-bore figure (310 kN over 170 mm) lets a NJ1034 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1034 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g NJ1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 260×42 mm envelope matches.",
      "Open NJ1034 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "Grease limiting speed 2,600 r/min and oil 3,000 r/min are different limits for NJ1034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1034?",
        "a": "NJ1034 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1034 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1034 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1034-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1034",
      "NJ1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3034",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 490,
    "static_load_kN": 775,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3034 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 490 kN dynamic rating in the 170 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3034 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3034. Equivalent-load planning treats NN3034 as a pure radial bearing: keep P below 490 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NN3034; an oversized radius locks the ring on its face and tilts the 67 mm-wide seat.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 12600 g NN3034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NN3034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NN3034: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN3034 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 490/775 kN ratings, 75 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3034?",
        "a": "NN3034 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 490 kN, C0 775 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 12600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3034 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3034?",
        "a": "NN3034 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3034?",
        "a": "NTN rates NN3034 at 2,300 r/min with grease and 2,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3034",
      "NN3034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3034K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3034K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 490,
    "static_load_kN": 775,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 12200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3034K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 490 kN dynamic rating in the 170 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3034K floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NN3034K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NN3034K as a pure radial bearing: keep P below 490 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3034K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 12200 g NN3034K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 67 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 67 mm-wide cavity.",
      "Do not replace NN3034K with a deep-groove ball bearing on rating alone: line contact gives 490 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NN3034K with a deep-groove ball bearing on rating alone: line contact gives 490 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 490/775 kN ratings, 75 kN Pu and 12200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3034K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3034K?",
        "a": "NN3034K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 490 kN, C0 775 kN, Pu 75 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 12200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3034K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3034K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3034K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3034K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3034 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3034K?",
        "a": "NTN rates NN3034K at 2,300 r/min with grease and 2,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3034K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3034k",
      "NN3034K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1034",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1034 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 310 kN dynamic rating in the 170 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1034 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 193 mm and Ew 237 mm — the envelope inside the 170/260 mm bore/OD where the rollers actually run. Speed ratio check: limiting 2,600 r/min is .87 of the 3,000 r/min oil value for NU1034; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NU1034; an oversized radius locks the ring on its face and tilts the 42 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g NU1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 260×42 mm envelope matches.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1034?",
        "a": "NU1034 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1034 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1034 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1034-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×260×42 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1034",
      "NU1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1034",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1034",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 42,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 310,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 38.5,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3000,
    "weight_g": 7760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1034 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 310 kN dynamic rating in the 170 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1034 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP1034. Mass 7760 g for the 170×260×42 mm NUP1034 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 170 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 3,000 r/min need positive flow and drain design; the 7760 g NUP1034 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 45.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 42 mm-wide cavity.",
      "Open NUP1034 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 42 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "The 310/400 kN ratings, 38.5 kN Pu and 7760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1034 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1034?",
        "a": "NUP1034 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 42 mm width (6.693 × 10.236 × 1.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 310 kN, C0 400 kN, Pu 38.5 kN, grease limiting speed 2,600 r/min, oil 3,000 r/min, mass about 7760 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1034 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1034 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1034 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1034?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 193 mm, Ew 237 mm. The nominal bore/OD remain 170/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,600 r/min grease / 3,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1034",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1034",
      "NUP1034"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2234",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2234 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 170×310×86 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). The 70.0 mm radial section ((310−170)/2) frames the roller complement; capacity per millimetre of bore is about 4.7 kN/mm before application factors. Rating life at 795 kN C assumes clean oil and adequate film; the 101 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2234 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g N2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2234 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2234?",
        "a": "N2234 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2234 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2234 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2234",
      "N2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N234",
    "brand": "NTN",
    "manufacturer_designation": "NTN N234",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N234 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 530 kN dynamic rating in the 170 mm bore. Numbering ties N234 to its envelope: type code N, series N200, 170 mm bore; the 310×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N234 designation when purchasing. The 170 mm (6.693 in) bore and 310 mm (12.205 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 52 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N234 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g N234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N234?",
        "a": "N234 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N234 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N234 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n234",
      "N234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF234",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NF234 on the 170×310 mm envelope, 52 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,200 r/min. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF234 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 208 mm and Ew 272 mm — the envelope inside the 170/310 mm bore/OD where the rollers actually run. Thermal planning around the 2,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 170 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF234.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NF234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NF234 with a deep-groove ball bearing on rating alone: line contact gives 530 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 530/635 kN pair here belongs to NF234 as printed, not to the bare size.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 170 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF234?",
        "a": "NF234 is an NTN NF single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF234 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF234 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf234",
      "NF234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2234",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2234 denotes a 170×310×86 mm (6.693 × 12.205 × 3.386 in) cylindrical roller bearing in the NJ2200 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2234 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ2234 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g NJ2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NJ2234: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2234?",
        "a": "NJ2234 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2234 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2234 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2234",
      "NJ2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2234E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NJ2234E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,800 r/min on grease and 2,100 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 310 mm OD and 86 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2234E. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 2,100 r/min for continuously high-duty 170 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2234E.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NJ2234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NJ2234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The 1070/1410 kN ratings, 132 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2234E?",
        "a": "NJ2234E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1070 kN, C0 1410 kN, Pu 132 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2234E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2234E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2234e",
      "NJ2234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ234",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ234 appears as a 170 mm bore single-row cylindrical roller bearing (530 kN C / 635 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ234 floats or locates; the numeric remainder is the ISO 15 series and 170 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ234 designation when purchasing. The 170 mm (6.693 in) bore and 310 mm (12.205 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 52 mm-wide ring. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NJ234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ234 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Open NJ234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ234?",
        "a": "NJ234 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ234 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ234 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj234",
      "NJ234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ234E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ234E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 670 kN dynamic rating in the 170 mm bore. Numbering ties NJ234E to its envelope: type code NJ, series NJ200, 170 mm bore; the 310×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NJ234E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 670 kN C assumes clean oil and adequate film; the 75 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 170 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NJ234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/800 kN pair here belongs to NJ234E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 670/800 kN pair here belongs to NJ234E as printed, not to the bare size.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Do not replace NJ234E with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 670/800 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ234E?",
        "a": "NJ234E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 800 kN, Pu 75 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ234E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ234E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 207 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj234e",
      "NJ234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2234",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2234 appears as a 170 mm bore single-row cylindrical roller bearing (795 kN C / 1080 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU2234 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NU2234 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 4.7 kN-per-mm-bore figure (795 kN over 170 mm) lets a NU2234 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 170 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g NU2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU2234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2234?",
        "a": "NU2234 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2234 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2234 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2234",
      "NU2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2234E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2234E denotes a 170×310×86 mm (6.693 × 12.205 × 3.386 in) cylindrical roller bearing in the NU2200 family, the high-capacity pressed-steel cage of the E execution. Digit by digit, NU2234E reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 205 mm — the envelope inside the 170/310 mm bore/OD where the rollers actually run. The 6.3 kN-per-mm-bore figure (1070 kN over 170 mm) lets a NU2234E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NU2234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2234E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×86 mm envelope matches.",
      "The 1070/1410 kN ratings, 132 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2234E?",
        "a": "NU2234E is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1070 kN, C0 1410 kN, Pu 132 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2234E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2234E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2234e",
      "NU2234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU234",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU234 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 170×310×52 mm ISO 15 envelope. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 310 mm OD and 52 mm width from the ISO 15 general plan. The 52 mm width and 70.0 mm section put the NU200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NU234 as a pure radial bearing: keep P below 530 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NU234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU234 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 170 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×52 mm envelope matches.",
      "Open NU234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU234?",
        "a": "NU234 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU234 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU234 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU234-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×310×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu234",
      "NU234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU234E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU234E on the 170×310 mm envelope, 52 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 2,000 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NU234E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 75 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.19 (800/670 kN) shows the high-static-capacity proportioning of this 170 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NU234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU234E with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU234E skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 670/800 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU234E?",
        "a": "NU234E is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 800 kN, Pu 75 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU234E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU234E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 207 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu234e",
      "NU234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2234",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 795,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2234 is the wide (22) section of the NTN NUP2200 dimension series for a 170 mm shaft — 795 kN of basic dynamic capacity in a 26700 g, open bearing. Digit by digit, NUP2234 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2234. Thermal planning around the 2,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,300 r/min for continuously high-duty 170 mm positions. Heat the inner ring to max 120 °C for the 170 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 26700 g NUP2234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2234 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "If the shaft must be located both ways, do not use NUP2234 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The 795/1080 kN ratings, 101 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2234?",
        "a": "NUP2234 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 795 kN, C0 1080 kN, Pu 101 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 26700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2234 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2234 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2234",
      "NUP2234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2234E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1070,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2234E appears as a 170 mm bore single-row cylindrical roller bearing (1070 kN C / 1410 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NUP2234E to its envelope: type code NUP, series NUP2200, 170 mm bore; the 310×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2234E. Equivalent-load planning treats NUP2234E as a pure radial bearing: keep P below 1070 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2234E.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the NUP2234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP2234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2234E skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NUP2234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "The 1070/1410 kN ratings, 132 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2234E?",
        "a": "NUP2234E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1070 kN, C0 1410 kN, Pu 132 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2234E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2234E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2234e",
      "NUP2234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP234",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP234",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 530,
    "static_load_kN": 635,
    "fatigue_load_limit_kN": 59.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2500,
    "weight_g": 16700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NUP234: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,200 r/min on grease and 2,500 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,200 r/min grease and 2,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 170 mm bore. Thermal planning around the 2,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,500 r/min for continuously high-duty 170 mm positions. Housing and shaft fillets must clear the ring chamfers of NUP234; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,500 r/min need positive flow and drain design; the 16700 g NUP234 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 70.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "If the shaft must be located both ways, do not use NUP234 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 530/635 kN ratings, 59.5 kN Pu and 16700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP234 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP234?",
        "a": "NUP234 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 530 kN, C0 635 kN, Pu 59.5 kN, grease limiting speed 2,200 r/min, oil 2,500 r/min, mass about 16700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP234 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP234 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP234 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP234?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 208 mm, Ew 272 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP234",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup234",
      "NUP234"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP234E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP234E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 670,
    "static_load_kN": 800,
    "fatigue_load_limit_kN": 75,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NUP234E: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 2,000 r/min on grease and 2,300 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,000 r/min grease and 2,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 170 mm bore. Equivalent-load planning treats NUP234E as a pure radial bearing: keep P below 670 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Housing and shaft fillets must clear the ring chamfers of NUP234E; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the NUP234E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP234E with a deep-groove ball bearing on rating alone: line contact gives 670 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 310 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NUP234E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 670/800 kN ratings, 75 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP234E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP234E?",
        "a": "NUP234E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 52 mm width (6.693 × 12.205 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 670 kN, C0 800 kN, Pu 75 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP234E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP234E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP234E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP234E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 207 mm. The nominal bore/OD remain 170/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP234E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup234e",
      "NUP234E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2334",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2334 on the 170×360 mm envelope, 120 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. Digit by digit, N2334 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 170 mm bore. Selection arithmetic: Pu 159 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.29 (1750/1360 kN) shows the high-static-capacity proportioning of this 170 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2334 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g N2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1360/1750 kN pair here belongs to N2334 as printed, not to the bare size.",
      "Open N2334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use N2334 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2334?",
        "a": "N2334 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2334 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2334 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2334",
      "N2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N334",
    "brand": "NTN",
    "manufacturer_designation": "NTN N334",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N334 appears as a 170 mm bore single-row cylindrical roller bearing (885 kN C / 1010 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 360 mm OD and 72 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 220 mm and Ew 310 mm — the envelope inside the 170/360 mm bore/OD where the rollers actually run. Rating life at 885 kN C assumes clean oil and adequate film; the 92 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g N334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×72 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 885/1010 kN pair here belongs to N334 as printed, not to the bare size.",
      "The N rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×72 mm envelope matches.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N334?",
        "a": "N334 is an NTN N single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N334 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N334 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n334",
      "N334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF334",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 170 mm shaft NTN supplies NF334: one integral rib on each ring; the open execution is rated 1,800 r/min on grease and 2,200 r/min on oil. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). At 2,200 r/min with oil versus 1,800 r/min with grease (a 400 r/min band), lubrication choice for NF334 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 92 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.14 (1010/885 kN) shows the high-static-capacity proportioning of this 170 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 170 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NF334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 72 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NF334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Grease limiting speed 1,800 r/min and oil 2,200 r/min are different limits for NF334: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF334?",
        "a": "NF334 is an NTN NF single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF334 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF334 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf334",
      "NF334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2334",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2334 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 170×360×120 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 220 mm and Ew 310 mm — the envelope inside the 170/360 mm bore/OD where the rollers actually run. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NJ2334; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ2334; an oversized radius locks the ring on its face and tilts the 120 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g NJ2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "If the shaft must be located both ways, do not use NJ2334 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NJ2334 with a deep-groove ball bearing on rating alone: line contact gives 1360 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 170 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 360×120 mm envelope matches.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2334?",
        "a": "NJ2334 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2334 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2334 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2334-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×120 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2334",
      "NJ2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ334",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ334 is the standard section of the NTN NJ300 dimension series for a 170 mm shaft — 885 kN of basic dynamic capacity in a 36100 g, open bearing. Digit by digit, NJ334 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 170 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 2,200 r/min with oil versus 1,800 r/min with grease (a 400 r/min band), lubrication choice for NJ334 is a thermal decision, not just a sealing one. Mass 36100 g for the 170×360×72 mm NJ334 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NJ334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 95.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Do not replace NJ334 with a deep-groove ball bearing on rating alone: line contact gives 885 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,800 r/min and oil 2,200 r/min are different limits for NJ334: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,800 r/min and oil 2,200 r/min are different limits for NJ334: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ334?",
        "a": "NJ334 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ334 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ334 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj334",
      "NJ334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2334",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2334 is the extra-wide (23) section of the NTN NU2300 dimension series for a 170 mm shaft — 1360 kN of basic dynamic capacity in a 58300 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 360 mm OD and 120 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU2334 designation when purchasing. The 170 mm (6.693 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 120 mm-wide ring. Heat the inner ring to max 120 °C for the 170 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g NU2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Open NU2334 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 170 mm contact.",
      "Do not replace NU2334 with a deep-groove ball bearing on rating alone: line contact gives 1360 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 120 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2334?",
        "a": "NU2334 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2334 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2334 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2334-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×120 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2334",
      "NU2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU334",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU334 on the 170×360 mm envelope, 72 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,800 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 170 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU334. Selection arithmetic: Pu 92 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.14 (1010/885 kN) shows the high-static-capacity proportioning of this 170 mm bore. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NU334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 95.0 mm section at 170 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Do not replace NU334 with a deep-groove ball bearing on rating alone: line contact gives 885 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NU334 with a deep-groove ball bearing on rating alone: line contact gives 885 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU334?",
        "a": "NU334 is an NTN NU single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU334 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU334 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU334-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 170×360×72 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu334",
      "NU334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2334",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 58300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2334 denotes a 170×360×120 mm (6.693 × 14.173 × 4.724 in) cylindrical roller bearing in the NUP2300 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 170 mm, with 360 mm OD and 120 mm width from the ISO 15 general plan. With C 1360 kN and C0 1750 kN (C0/C ≈ 1.29) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 8.0 kN-per-mm-bore figure (1360 kN over 170 mm) lets a NUP2334 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2334.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 58300 g NUP2334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1360/1750 kN pair here belongs to NUP2334 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NUP2334 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2334 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 1360/1750 kN ratings, 159 kN Pu and 58300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2334?",
        "a": "NUP2334 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1750 kN, Pu 159 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 58300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2334 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2334 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2334",
      "NUP2334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP334",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP334",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 885,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 92,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 36100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP334 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 885 kN dynamic rating in the 170 mm bore. Numbering ties NUP334 to its envelope: type code NUP, series NUP300, 170 mm bore; the 360×72 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 885 kN and C0 1010 kN (C0/C ≈ 1.14) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Housing and shaft fillets must clear the ring chamfers of NUP334; an oversized radius locks the ring on its face and tilts the 72 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 170 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 36100 g NUP334 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 72 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 170 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 170 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP334 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The 885/1010 kN ratings, 92 kN Pu and 36100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP334 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP334?",
        "a": "NUP334 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 72 mm width (6.693 × 14.173 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 885 kN, C0 1010 kN, Pu 92 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 36100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP334 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP334 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP334 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP334?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 220 mm, Ew 310 mm. The nominal bore/OD remain 170/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP334",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup334",
      "NUP334"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4936",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4936",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 510,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 93,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 9450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN4936 denotes a 180×250×69 mm (7.087 × 9.843 × 2.717 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4936 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 2.8 kN-per-mm-bore figure (510 kN over 180 mm) lets a NN4936 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN4936 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 9450 g NN4936 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4936 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 69 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 69 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 510/965 kN ratings, 93 kN Pu and 9450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4936 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4936?",
        "a": "NN4936 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 69 mm width (7.087 × 9.843 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 965 kN, Pu 93 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 9450 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4936 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4936 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4936?",
        "a": "NN4936 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4936?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 202 mm. The nominal bore/OD remain 180/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4936",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4936",
      "NN4936"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4936K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4936K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 510,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 93,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 9010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4936K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 180×250×69 mm ISO 15 envelope. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 250 mm OD and 69 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 9010 g for the 180×250×69 mm NN4936K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN4936K.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 9010 g NN4936K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 250 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4936K skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 510/965 kN pair here belongs to NN4936K as printed, not to the bare size.",
      "The 510/965 kN ratings, 93 kN Pu and 9010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4936K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4936K?",
        "a": "NN4936K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 69 mm width (7.087 × 9.843 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 965 kN, Pu 93 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 9010 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4936K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4936K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4936K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4936K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4936 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4936K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 202 mm. The nominal bore/OD remain 180/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4936K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4936k",
      "NN4936K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4936K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4936K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 510,
    "static_load_kN": 965,
    "fatigue_load_limit_kN": 93,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 9460,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NNU4936K appears as a 180 mm bore single-row cylindrical roller bearing (510 kN C / 965 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. The 2.8 kN-per-mm-bore figure (510 kN over 180 mm) lets a NNU4936K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 9460 g NNU4936K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NNU4936K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 510/965 kN pair here belongs to NNU4936K as printed, not to the bare size.",
      "Grease limiting speed 2,300 r/min and oil 2,700 r/min are different limits for NNU4936K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 69 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 510/965 kN ratings, 93 kN Pu and 9460 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4936K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4936K?",
        "a": "NNU4936K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 69 mm width (7.087 × 9.843 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 510 kN, C0 965 kN, Pu 93 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 9460 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4936K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4936K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4936K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4936K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4936 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4936K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 202 mm. The nominal bore/OD remain 180/250 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4936K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4936k",
      "NNU4936K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1036",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1036 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 180×280×46 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 280 mm OD and 46 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1036 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Housing and shaft fillets must clear the ring chamfers of N1036; an oversized radius locks the ring on its face and tilts the 46 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g N1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 380/485 kN pair here belongs to N1036 as printed, not to the bare size.",
      "Do not replace N1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1036?",
        "a": "N1036 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1036 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1036 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1036",
      "N1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1036",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ1036 denotes a 180×280×46 mm (7.087 × 11.024 × 1.811 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. Numbering ties NJ1036 to its envelope: type code NJ, series NJ1000, 180 mm bore; the 280×46 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 380 kN and C0 485 kN (C0/C ≈ 1.28) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Rating life at 380 kN C assumes clean oil and adequate film; the 46.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g NJ1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ1036 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Do not replace NJ1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1036 skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1036?",
        "a": "NJ1036 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1036 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1036 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1036-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1036",
      "NJ1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3036",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 630,
    "static_load_kN": 995,
    "fatigue_load_limit_kN": 94.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3036 appears as a 180 mm bore single-row cylindrical roller bearing (630 kN C / 995 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Mass 16600 g for the 180×280×74 mm NN3036 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16600 g NN3036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3036 does not substitute a precision-class execution.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 630/995 kN ratings, 94.5 kN Pu and 16600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3036?",
        "a": "NN3036 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 630 kN, C0 995 kN, Pu 94.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3036 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3036?",
        "a": "NN3036 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3036?",
        "a": "NTN rates NN3036 at 2,200 r/min with grease and 2,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3036",
      "NN3036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3036K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3036K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 630,
    "static_load_kN": 995,
    "fatigue_load_limit_kN": 94.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 16000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3036K denotes a 180×280×74 mm (7.087 × 11.024 × 2.913 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN3036K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NN3036K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 630 kN C assumes clean oil and adequate film; the 94.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 180 mm shaft.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 16000 g NN3036K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 180 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 280×74 mm envelope matches.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 50.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 74 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 630/995 kN ratings, 94.5 kN Pu and 16000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3036K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3036K?",
        "a": "NN3036K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 630 kN, C0 995 kN, Pu 94.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 16000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3036K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3036K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3036K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3036K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3036 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3036K?",
        "a": "NTN rates NN3036K at 2,200 r/min with grease and 2,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3036K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3036k",
      "NN3036K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1036",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1036 appears as a 180 mm bore single-row cylindrical roller bearing (380 kN C / 485 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1036. Selection arithmetic: Pu 46.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.28 (485/380 kN) shows the high-static-capacity proportioning of this 180 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g NU1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "Do not replace NU1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NU1036 with a deep-groove ball bearing on rating alone: line contact gives 380 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1036?",
        "a": "NU1036 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1036 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1036 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1036-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×280×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1036",
      "NU1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1036",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1036",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 380,
    "static_load_kN": 485,
    "fatigue_load_limit_kN": 46.5,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 2900,
    "weight_g": 10100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1036 appears as a 180 mm bore single-row cylindrical roller bearing (380 kN C / 485 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1036 designation when purchasing. The 180 mm (7.087 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 46 mm-wide ring. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 180 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,900 r/min need positive flow and drain design; the 10100 g NUP1036 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 280 mm race brinells and releases as vibration within hours.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1036 skids at 2,400 r/min and fails by smearing long before L10 fatigue.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 380/485 kN ratings, 46.5 kN Pu and 10100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1036 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1036?",
        "a": "NUP1036 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 46 mm width (7.087 × 11.024 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 380 kN, C0 485 kN, Pu 46.5 kN, grease limiting speed 2,400 r/min, oil 2,900 r/min, mass about 10100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1036 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1036 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1036 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1036?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 205 mm, Ew 255 mm. The nominal bore/OD remain 180/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,400 r/min grease / 2,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1036",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1036",
      "NUP1036"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2236",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2236 on the 180×320 mm envelope, 86 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,800 r/min. Digit by digit, N2236 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g N2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace N2236 with a deep-groove ball bearing on rating alone: line contact gives 825 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to N2236 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2236 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to N2236 as printed, not to the bare size.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2236?",
        "a": "N2236 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2236 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2236 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2236",
      "N2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N236",
    "brand": "NTN",
    "manufacturer_designation": "NTN N236",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N236 appears as a 180 mm bore single-row cylindrical roller bearing (550 kN C / 675 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 320 mm OD and 52 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. The 3.1 kN-per-mm-bore figure (550 kN over 180 mm) lets a N236 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g N236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "Do not replace N236 with a deep-groove ball bearing on rating alone: line contact gives 550 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 550/675 kN pair here belongs to N236 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N236?",
        "a": "N236 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N236 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N236 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n236",
      "N236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF236",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies NF236: one integral rib on each ring; the open execution is rated 2,000 r/min on grease and 2,400 r/min on oil. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF236. Speed ratio check: limiting 2,000 r/min is .83 of the 2,400 r/min oil value for NF236; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NF236; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NF236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NF236: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NF236: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NF236 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF236?",
        "a": "NF236 is an NTN NF single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF236 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF236 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf236",
      "NF236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2236",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2236 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 180×320×86 mm ISO 15 envelope. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,800 r/min grease and 2,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,200 r/min for continuously high-duty 180 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2236.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g NJ2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NJ2236 with a deep-groove ball bearing on rating alone: line contact gives 825 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NJ2236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2236?",
        "a": "NJ2236 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2236 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2236 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2236",
      "NJ2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2236E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1510,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2236E is the wide (22) section of the NTN NJ2200 dimension series for a 180 mm shaft — 1120 kN of basic dynamic capacity in a open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. Mass Dimensions 180×320×86 mm and the 1120 kN C rating define the substitution envelope; check the 2203E mass column for this exact NJ2236E execution. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NJ2236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ2236E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ2236E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ2236E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1120/1510 kN ratings, 139 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2236E?",
        "a": "NJ2236E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1120 kN, C0 1510 kN, Pu 139 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2236E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2236E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2236e",
      "NJ2236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ236",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ236 is the standard section of the NTN NJ200 dimension series for a 180 mm shaft — 550 kN of basic dynamic capacity in a 17300 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 180 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. The 3.1 kN-per-mm-bore figure (550 kN over 180 mm) lets a NJ236 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ236.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NJ236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ236 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "If the shaft must be located both ways, do not use NJ236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ236?",
        "a": "NJ236 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ236 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ236 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj236",
      "NJ236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ236E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 695,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 78.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ236E denotes a 180×320×52 mm (7.087 × 12.598 × 2.047 in) cylindrical roller bearing in the NJ200 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ236E floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NJ236E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 78.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.22 (850/695 kN) shows the high-static-capacity proportioning of this 180 mm bore. Housing and shaft fillets must clear the ring chamfers of NJ236E; an oversized radius locks the ring on its face and tilts the 52 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NJ236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NJ236E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NJ236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 695/850 kN ratings, 78.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ236E?",
        "a": "NJ236E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 695 kN, C0 850 kN, Pu 78.5 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ236E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ236E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 217 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj236e",
      "NJ236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2236",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2236 is the wide (22) section of the NTN NU2200 dimension series for a 180 mm shaft — 825 kN of basic dynamic capacity in a 27800 g, open bearing. Numbering ties NU2236 to its envelope: type code NU, series NU2200, 180 mm bore; the 320×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 70.0 mm radial section ((320−180)/2) frames the roller complement; capacity per millimetre of bore is about 4.6 kN/mm before application factors. Rating life at 825 kN C assumes clean oil and adequate film; the 106 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g NU2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2236 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to NU2236 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 825/1140 kN pair here belongs to NU2236 as printed, not to the bare size.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 86 mm-wide cavity.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2236?",
        "a": "NU2236 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2236 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2236 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×86 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2236",
      "NU2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2236E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1510,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies NU2236E: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 320 mm OD and 86 mm width from the ISO 15 general plan. the trailing E marks NTN high-capacity internal design at this larger bore, with the pressed-steel cage execution; quote the full NU2236E designation when purchasing. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NU2236E; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NU2236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2236E with a deep-groove ball bearing on rating alone: line contact gives 1120 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Do not replace NU2236E with a deep-groove ball bearing on rating alone: line contact gives 1120 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 1120/1510 kN ratings, 139 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2236E?",
        "a": "NU2236E is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1120 kN, C0 1510 kN, Pu 139 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2236E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2236E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2236e",
      "NU2236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU236",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU236 on the 180×320 mm envelope, 52 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU236 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU236 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 17300 g for the 180×320×52 mm NU236 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU236.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NU236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU236 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 70.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 52 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 550/675 kN pair here belongs to NU236 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU236?",
        "a": "NU236 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU236 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU236 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU236-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×320×52 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu236",
      "NU236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU236E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 695,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 78.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU236E appears as a 180 mm bore single-row cylindrical roller bearing (695 kN C / 850 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Numbering ties NU236E to its envelope: type code NU, series NU200, 180 mm bore; the 320×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. The 3.9 kN-per-mm-bore figure (695 kN over 180 mm) lets a NU236E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NU236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Open NU236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Open NU236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 695/850 kN pair here belongs to NU236E as printed, not to the bare size.",
      "The 695/850 kN ratings, 78.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU236E?",
        "a": "NU236E is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 695 kN, C0 850 kN, Pu 78.5 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU236E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU236E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 217 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu236e",
      "NU236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2236",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 825,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 27800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2236 denotes a 180×320×86 mm (7.087 × 12.598 × 3.386 in) cylindrical roller bearing in the NUP2200 family, a pressed sheet-steel cage. Numbering ties NUP2236 to its envelope: type code NUP, series NUP2200, 180 mm bore; the 320×86 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2236 designation when purchasing. Speed ratio check: limiting 1,800 r/min is .82 of the 2,200 r/min oil value for NUP2236; grease-churn heating closes that gap as fill quantity rises. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 27800 g NUP2236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2236 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×86 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP2236 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 86 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 825/1140 kN ratings, 106 kN Pu and 27800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2236?",
        "a": "NUP2236 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 825 kN, C0 1140 kN, Pu 106 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 27800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2236 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2236 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2236",
      "NUP2236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2236E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1120,
    "static_load_kN": 1510,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2236E is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 180×320×86 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2236E floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. The 86 mm width and 70.0 mm section put the NUP2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 180 mm (7.087 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 86 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP2236E; an oversized radius locks the ring on its face and tilts the 86 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NUP2236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 320 mm race brinells and releases as vibration within hours.",
      "Open NUP2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2236E skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP2236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 1120/1510 kN ratings, 139 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2236E?",
        "a": "NUP2236E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1120 kN, C0 1510 kN, Pu 139 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2236E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2236E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2236e",
      "NUP2236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP236",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP236",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 675,
    "fatigue_load_limit_kN": 62.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP236 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 550 kN dynamic rating in the 180 mm bore. Digit by digit, NUP236 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP236 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 2,000 r/min is .83 of the 2,400 r/min oil value for NUP236; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17300 g NUP236 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 320×52 mm envelope matches.",
      "Do not replace NUP236 with a deep-groove ball bearing on rating alone: line contact gives 550 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP236 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NUP236 with a deep-groove ball bearing on rating alone: line contact gives 550 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 550/675 kN ratings, 62.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP236 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP236?",
        "a": "NUP236 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 675 kN, Pu 62.5 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP236 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP236 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP236 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP236?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 218 mm, Ew 282 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP236",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup236",
      "NUP236"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP236E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP236E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 695,
    "static_load_kN": 850,
    "fatigue_load_limit_kN": 78.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP236E is the standard section of the NTN NUP200 dimension series for a 180 mm shaft — 695 kN of basic dynamic capacity in a open bearing. Numbering ties NUP236E to its envelope: type code NUP, series NUP200, 180 mm bore; the 320×52 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 52 mm width and 70.0 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 695 kN C assumes clean oil and adequate film; the 78.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP236E.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the NUP236E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 52 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 695/850 kN pair here belongs to NUP236E as printed, not to the bare size.",
      "Do not replace NUP236E with a deep-groove ball bearing on rating alone: line contact gives 695 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NUP236E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The 695/850 kN ratings, 78.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP236E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP236E?",
        "a": "NUP236E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 52 mm width (7.087 × 12.598 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 695 kN, C0 850 kN, Pu 78.5 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP236E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP236E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP236E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP236E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 217 mm. The nominal bore/OD remain 180/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP236E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup236e",
      "NUP236E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2336",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies N2336: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,500 r/min on grease and 1,800 r/min on oil. Numbering ties N2336 to its envelope: type code N, series N2300, 180 mm bore; the 380×126 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2336 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats N2336 as a pure radial bearing: keep P below 1530 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 180 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g N2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 126 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 126 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "If the shaft must be located both ways, do not use N2336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace N2336 with a deep-groove ball bearing on rating alone: line contact gives 1530 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2336?",
        "a": "N2336 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2336 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2336 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2336",
      "N2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N336",
    "brand": "NTN",
    "manufacturer_designation": "NTN N336",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N336 is the standard section of the NTN N300 dimension series for a 180 mm shaft — 1000 kN of basic dynamic capacity in a 43200 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N336 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N336. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N336.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g N336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N336 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N336: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open N336 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N336?",
        "a": "N336 is an NTN N single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N336 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N336 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n336",
      "N336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF336",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF336 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1000 kN dynamic rating in the 180 mm bore. Digit by digit, NF336 reads as NF (one rib on each ring), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1000 kN and C0 1150 kN (C0/C ≈ 1.15) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Equivalent-load planning treats NF336 as a pure radial bearing: keep P below 1000 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 180 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NF336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 75 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NF336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 75 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF336 skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF336?",
        "a": "NF336 is an NTN NF single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF336 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF336 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf336",
      "NF336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2336",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2336 on the 180×380 mm envelope, 126 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,500 r/min. Digit by digit, NJ2336 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2336. Selection arithmetic: Pu 179 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.30 (1990/1530 kN) shows the high-static-capacity proportioning of this 180 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g NJ2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2336 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 380×126 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2336?",
        "a": "NJ2336 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2336 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2336 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2336-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×126 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2336",
      "NJ2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ336",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ336 denotes a 180×380×75 mm (7.087 × 14.961 × 2.953 in) cylindrical roller bearing in the NJ300 family, a pressed sheet-steel cage. Numbering ties NJ336 to its envelope: type code NJ, series NJ300, 180 mm bore; the 380×75 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1000 kN and C0 1150 kN (C0/C ≈ 1.15) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 180 mm (7.087 in) bore and 380 mm (14.961 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 75 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ336.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NJ336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ336 skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ336?",
        "a": "NJ336 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ336 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ336 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ336-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj336",
      "NJ336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2336",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2336 denotes a 180×380×126 mm (7.087 × 14.961 × 4.961 in) cylindrical roller bearing in the NU2300 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2336 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,500 r/min grease and 1,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 180 mm bore. The 8.5 kN-per-mm-bore figure (1530 kN over 180 mm) lets a NU2336 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g NU2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 126 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NU2336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2336?",
        "a": "NU2336 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2336 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2336 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2336-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×126 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2336",
      "NU2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU336",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 180 mm shaft NTN supplies NU336: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. Digit by digit, NU336 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 180 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU336 designation when purchasing. Equivalent-load planning treats NU336 as a pure radial bearing: keep P below 1000 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU336.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NU336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "The 75 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 180 mm inner ring.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU336?",
        "a": "NU336 is an NTN NU single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU336 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU336 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU336-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 180×380×75 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu336",
      "NU336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2336",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1530,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 68100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2336 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 180×380×126 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2336 floats or locates; the numeric remainder is the ISO 15 series and 180 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 232 mm and Ew 328 mm — the envelope inside the 180/380 mm bore/OD where the rollers actually run. Rating life at 1530 kN C assumes clean oil and adequate film; the 179 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NUP2336; an oversized radius locks the ring on its face and tilts the 126 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 68100 g NUP2336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 180 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP2336 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 180 mm contact.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 380×126 mm envelope matches.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 380×126 mm envelope matches.",
      "The 1530/1990 kN ratings, 179 kN Pu and 68100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2336?",
        "a": "NUP2336 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 1990 kN, Pu 179 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 68100 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2336 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2336 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2336",
      "NUP2336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP336",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP336",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 1150,
    "fatigue_load_limit_kN": 103,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 43200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP336 appears as a 180 mm bore single-row cylindrical roller bearing (1000 kN C / 1150 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 180 mm, with 380 mm OD and 75 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 232 mm and Ew 328 mm — the envelope inside the 180/380 mm bore/OD where the rollers actually run. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,000 r/min for continuously high-duty 180 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 180 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 180 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 43200 g NUP336 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100.0 mm section at 180 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 75 mm-wide cavity.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NUP336: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NUP336 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 180 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 380×75 mm envelope matches.",
      "The 1000/1150 kN ratings, 103 kN Pu and 43200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP336 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP336?",
        "a": "NUP336 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 75 mm width (7.087 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 1150 kN, Pu 103 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 43200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP336 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP336 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP336 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP336?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 232 mm, Ew 328 mm. The nominal bore/OD remain 180/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP336",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup336",
      "NUP336"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4938",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4938",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 525,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 98,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 9930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4938 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×260×69 mm ISO 15 envelope. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 2,200 r/min grease and 2,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Rating life at 525 kN C assumes clean oil and adequate film; the 98 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 190 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 9930 g NN4938 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4938 with a deep-groove ball bearing on rating alone: line contact gives 525 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4938 does not substitute a precision-class execution.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4938 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4938 does not substitute a precision-class execution.",
      "The 525/1030 kN ratings, 98 kN Pu and 9930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4938 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4938?",
        "a": "NN4938 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 69 mm width (7.48 × 10.236 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 525 kN, C0 1030 kN, Pu 98 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 9930 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4938 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4938 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4938?",
        "a": "NN4938 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4938?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 212 mm. The nominal bore/OD remain 190/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4938",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4938",
      "NN4938"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4938K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4938K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 525,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 98,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 9470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4938K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 525 kN dynamic rating in the 190 mm bore. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). With C 525 kN and C0 1030 kN (C0/C ≈ 1.96) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 9470 g NN4938K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4938K skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "Open NN4938K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NN4938K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4938K skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 525/1030 kN ratings, 98 kN Pu and 9470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4938K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4938K?",
        "a": "NN4938K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 69 mm width (7.48 × 10.236 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 525 kN, C0 1030 kN, Pu 98 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 9470 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4938K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4938K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4938K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4938K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4938 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4938K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 212 mm. The nominal bore/OD remain 190/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4938K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4938k",
      "NN4938K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4938K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4938K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 525,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 98,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 9940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4938K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×260×69 mm ISO 15 envelope. Numbering ties NNU4938K to its envelope: type code NNU, series NNU4900, 190 mm bore; the 260×69 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NNU4938K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 2,200 r/min is .85 of the 2,600 r/min oil value for NNU4938K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NNU4938K; an oversized radius locks the ring on its face and tilts the 69 mm-wide seat.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 9940 g NNU4938K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 35.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 69 mm-wide cavity.",
      "The K tapered bore of NNU4938K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 260 mm race brinells and releases as vibration within hours.",
      "Do not replace NNU4938K with a deep-groove ball bearing on rating alone: line contact gives 525 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 525/1030 kN ratings, 98 kN Pu and 9940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4938K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4938K?",
        "a": "NNU4938K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 69 mm width (7.48 × 10.236 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 525 kN, C0 1030 kN, Pu 98 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 9940 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4938K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4938K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4938K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4938K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4938 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4938K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 212 mm. The nominal bore/OD remain 190/260 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4938K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4938k",
      "NNU4938K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1038",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N1038 on the 190×290 mm envelope, 46 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,300 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N1038 floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 2,300 r/min grease and 2,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Thermal planning around the 2,300 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,700 r/min for continuously high-duty 190 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g N1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use N1038 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use N1038 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1038?",
        "a": "N1038 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1038 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1038 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1038",
      "N1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1038",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1038 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 190×290×46 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 290 mm OD and 46 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 215 mm and Ew 265 mm — the envelope inside the 190/290 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g NJ1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1038 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1038 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 290×46 mm envelope matches.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1038?",
        "a": "NJ1038 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1038 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1038 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1038-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1038",
      "NJ1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3038",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 640,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 97,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3038 is the standard section of the NTN NN3000 dimension series for a 190 mm shaft — 640 kN of basic dynamic capacity in a 18000 g, open bearing. Digit by digit, NN3038 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,000 r/min grease and 2,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. The 190 mm (7.48 in) bore and 290 mm (11.417 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 75 mm-wide ring. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 190 mm shaft.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 18000 g NN3038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 640/1040 kN pair here belongs to NN3038 as printed, not to the bare size.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3038 does not substitute a precision-class execution.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3038 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3038 does not substitute a precision-class execution.",
      "The 640/1040 kN ratings, 97 kN Pu and 18000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3038?",
        "a": "NN3038 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 640 kN, C0 1040 kN, Pu 97 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 18000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3038 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3038?",
        "a": "NN3038 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3038?",
        "a": "NTN rates NN3038 at 2,000 r/min with grease and 2,400 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3038",
      "NN3038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3038K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3038K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 640,
    "static_load_kN": 1040,
    "fatigue_load_limit_kN": 97,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NN3038K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 2,000 r/min on grease and 2,400 r/min on oil. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 290 mm OD and 75 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 97 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.63 (1040/640 kN) shows the high-static-capacity proportioning of this 190 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 17400 g NN3038K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 2,000 r/min and oil 2,400 r/min are different limits for NN3038K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 640/1040 kN pair here belongs to NN3038K as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3038K skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 640/1040 kN pair here belongs to NN3038K as printed, not to the bare size.",
      "The 640/1040 kN ratings, 97 kN Pu and 17400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3038K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3038K?",
        "a": "NN3038K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 640 kN, C0 1040 kN, Pu 97 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3038K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3038K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3038K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3038K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3038 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3038K?",
        "a": "NTN rates NN3038K at 2,000 r/min with grease and 2,400 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3038K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3038k",
      "NN3038K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1038",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1038 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 190 mm shaft — 390 kN of basic dynamic capacity in a 10500 g, open bearing. Digit by digit, NU1038 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU1038 designation when purchasing. Equivalent-load planning treats NU1038 as a pure radial bearing: keep P below 390 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 190 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g NU1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 290 mm race brinells and releases as vibration within hours.",
      "The 46 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1038?",
        "a": "NU1038 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1038 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1038 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1038-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×290×46 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1038",
      "NU1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1038",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1038",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 390,
    "static_load_kN": 510,
    "fatigue_load_limit_kN": 48,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2700,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1038 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 190 mm shaft — 390 kN of basic dynamic capacity in a 10500 g, open bearing. Digit by digit, NUP1038 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 2,300 r/min grease and 2,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. The 2.1 kN-per-mm-bore figure (390 kN over 190 mm) lets a NUP1038 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP1038 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,700 r/min need positive flow and drain design; the 10500 g NUP1038 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1038 skids at 2,300 r/min and fails by smearing long before L10 fatigue.",
      "The 50.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 46 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NUP1038 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 390/510 kN ratings, 48 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1038 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1038?",
        "a": "NUP1038 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 46 mm width (7.48 × 11.417 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 390 kN, C0 510 kN, Pu 48 kN, grease limiting speed 2,300 r/min, oil 2,700 r/min, mass about 10500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1038 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1038 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1038 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1038?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 215 mm, Ew 265 mm. The nominal bore/OD remain 190/290 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,300 r/min grease / 2,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1038",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1038",
      "NUP1038"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2238",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies N2238: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. Numbering ties N2238 to its envelope: type code N, series N2200, 190 mm bore; the 340×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 2,000 r/min with oil versus 1,700 r/min with grease (a 300 r/min band), lubrication choice for N2238 is a thermal decision, not just a sealing one. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,000 r/min for continuously high-duty 190 mm positions. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g N2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N2238: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open N2238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for N2238: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2238?",
        "a": "N2238 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2238 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2238 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2238",
      "N2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N238",
    "brand": "NTN",
    "manufacturer_designation": "NTN N238",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N238 is the standard section of the NTN N200 dimension series for a 190 mm shaft — 615 kN of basic dynamic capacity in a 20800 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N238 floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded N238 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 615 kN C assumes clean oil and adequate film; the 70 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g N238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Open N238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Do not replace N238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N238?",
        "a": "N238 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N238 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N238 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n238",
      "N238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF238",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF238 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 615 kN dynamic rating in the 190 mm bore. Digit by digit, NF238 reads as NF (one rib on each ring), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NF238 designation when purchasing. Selection arithmetic: Pu 70 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (770/615 kN) shows the high-static-capacity proportioning of this 190 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NF238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NF238 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NF200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 55 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF238?",
        "a": "NF238 is an NTN NF single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF238 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF238 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf238",
      "NF238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2238",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2238 on the 190×340 mm envelope, 92 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,700 r/min. Digit by digit, NJ2238 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NJ2238 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,700 r/min is .85 of the 2,000 r/min oil value for NJ2238; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NJ2238; an oversized radius locks the ring on its face and tilts the 92 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g NJ2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NJ2238 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Do not replace NJ2238 with a deep-groove ball bearing on rating alone: line contact gives 920 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2238?",
        "a": "NJ2238 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2238 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2238 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2238",
      "NJ2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2238E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 152,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2238E on the 190×340 mm envelope, 92 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,500 r/min. Numbering ties NJ2238E to its envelope: type code NJ, series NJ2200, 190 mm bore; the 340×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 92 mm width and 75.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Heat the inner ring to max 120 °C for the 190 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the NJ2238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ2238E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NJ2238E with a deep-groove ball bearing on rating alone: line contact gives 1220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Open NJ2238E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 1220/1670 kN ratings, 152 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2238E?",
        "a": "NJ2238E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1670 kN, Pu 152 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2238E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2238E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 228 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2238e",
      "NJ2238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ238",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ238 denotes a 190×340×55 mm (7.48 × 13.386 × 2.165 in) cylindrical roller bearing in the NJ200 family, a pressed sheet-steel cage. Digit by digit, NJ238 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NJ238 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 615 kN C assumes clean oil and adequate film; the 70 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NJ238; an oversized radius locks the ring on its face and tilts the 55 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NJ238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ238 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NJ238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ238 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NJ238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ238?",
        "a": "NJ238 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ238 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ238 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj238",
      "NJ238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ238E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 770,
    "static_load_kN": 955,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NJ238E: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,700 r/min on grease and 2,000 r/min on oil. Digit by digit, NJ238E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 4.1 kN-per-mm-bore figure (770 kN over 190 mm) lets a NJ238E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ238E.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NJ238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ238E with a deep-groove ball bearing on rating alone: line contact gives 770 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NJ238E: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 770/955 kN pair here belongs to NJ238E as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 770/955 kN pair here belongs to NJ238E as printed, not to the bare size.",
      "The 770/955 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ238E?",
        "a": "NJ238E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 770 kN, C0 955 kN, Pu 86.5 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ238E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ238E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 230 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj238e",
      "NJ238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2238",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2238 denotes a 190×340×92 mm (7.48 × 13.386 × 3.622 in) cylindrical roller bearing in the NU2200 family, a pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 340 mm OD and 92 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2238.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g NU2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2238 with a deep-groove ball bearing on rating alone: line contact gives 920 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Open NU2238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 920/1290 kN pair here belongs to NU2238 as printed, not to the bare size.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2238?",
        "a": "NU2238 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2238 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2238 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2238",
      "NU2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2238E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 152,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2238E is the wide (22) section of the NTN NU2200 dimension series for a 190 mm shaft — 1220 kN of basic dynamic capacity in a open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU2238E at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 190 mm (7.48 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 92 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU2238E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the NU2238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 92 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×92 mm envelope matches.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "Do not replace NU2238E with a deep-groove ball bearing on rating alone: line contact gives 1220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1220/1670 kN ratings, 152 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2238E?",
        "a": "NU2238E is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1670 kN, Pu 152 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2238E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2238E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 228 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2238e",
      "NU2238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU238",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NU238: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,900 r/min on grease and 2,200 r/min on oil. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). The 75.0 mm radial section ((340−190)/2) frames the roller complement; capacity per millimetre of bore is about 3.2 kN/mm before application factors. The 190 mm (7.48 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 55 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU238; an oversized radius locks the ring on its face and tilts the 55 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NU238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU238 skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace NU238 with a deep-groove ball bearing on rating alone: line contact gives 615 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU238?",
        "a": "NU238 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU238 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU238 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu238",
      "NU238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU238E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 770,
    "static_load_kN": 955,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU238E is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×340×55 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU238E floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. With C 770 kN and C0 955 kN (C0/C ≈ 1.24) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 1,700 r/min is .85 of the 2,000 r/min oil value for NU238E; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU238E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NU238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×55 mm envelope matches.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 340×55 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 770/955 kN pair here belongs to NU238E as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU238E skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "The 770/955 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU238E?",
        "a": "NU238E is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 770 kN, C0 955 kN, Pu 86.5 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU238E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU238E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 230 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu238e",
      "NU238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2238",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 920,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 117,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2238 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 190×340×92 mm ISO 15 envelope. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 340 mm OD and 92 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,700 r/min grease and 2,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Selection arithmetic: Pu 117 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.40 (1290/920 kN) shows the high-static-capacity proportioning of this 190 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2238.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 33700 g NUP2238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP2238 with a deep-groove ball bearing on rating alone: line contact gives 920 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 920/1290 kN pair here belongs to NUP2238 as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×92 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP2238 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 920/1290 kN ratings, 117 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2238?",
        "a": "NUP2238 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 920 kN, C0 1290 kN, Pu 117 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 33700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2238 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2238 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2238",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2238",
      "NUP2238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2238E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 152,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2238E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1220 kN dynamic rating in the 190 mm bore. Digit by digit, NUP2238E reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 190 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 75.0 mm radial section ((340−190)/2) frames the roller complement; capacity per millimetre of bore is about 6.4 kN/mm before application factors. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,800 r/min for continuously high-duty 190 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2238E.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the NUP2238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2238E skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×92 mm envelope matches.",
      "The 92 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "The 1220/1670 kN ratings, 152 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2238E?",
        "a": "NUP2238E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1670 kN, Pu 152 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2238E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2238E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 228 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2238e",
      "NUP2238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP238",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP238",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 770,
    "fatigue_load_limit_kN": 70,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP238 appears as a 190 mm bore single-row cylindrical roller bearing (615 kN C / 770 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP238 to its envelope: type code NUP, series NUP200, 190 mm bore; the 340×55 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 55 mm width and 75.0 mm section put the NUP200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 70 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (770/615 kN) shows the high-static-capacity proportioning of this 190 mm bore. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 190 mm shaft.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 20800 g NUP238 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "Open NUP238 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 615/770 kN ratings, 70 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP238 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP238?",
        "a": "NUP238 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 770 kN, Pu 70 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 20800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP238 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP238 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP238 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP238?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 231 mm, Ew 299 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP238-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×340×55 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup238",
      "NUP238"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP238E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP238E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 770,
    "static_load_kN": 955,
    "fatigue_load_limit_kN": 86.5,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP238E on the 190×340 mm envelope, 55 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,700 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP238E floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. The 75.0 mm radial section ((340−190)/2) frames the roller complement; capacity per millimetre of bore is about 4.1 kN/mm before application factors. Selection arithmetic: Pu 86.5 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.24 (955/770 kN) shows the high-static-capacity proportioning of this 190 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the NUP238E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 340×55 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP238E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "The 75.0 mm section at 190 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 55 mm-wide cavity.",
      "The 770/955 kN ratings, 86.5 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP238E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP238E?",
        "a": "NUP238E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 55 mm width (7.48 × 13.386 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 770 kN, C0 955 kN, Pu 86.5 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP238E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP238E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP238E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP238E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 230 mm. The nominal bore/OD remain 190/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP238E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup238e",
      "NUP238E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2338",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2338 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1680 kN dynamic rating in the 190 mm bore. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 400 mm OD and 132 mm width from the ISO 15 general plan. The 132 mm width and 105.0 mm section put the N2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 78900 g for the 190×400×132 mm N2338 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g N2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 105.0 mm section at 190 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 132 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2338 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The N rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 400×132 mm envelope matches.",
      "Open N2338 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 190 mm contact.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2338?",
        "a": "N2338 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2338 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2338 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2338",
      "N2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N338",
    "brand": "NTN",
    "manufacturer_designation": "NTN N338",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N338 denotes a 190×400×78 mm (7.48 × 15.748 × 3.071 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N338 designation when purchasing. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,900 r/min for continuously high-duty 190 mm positions. Housing and shaft fillets must clear the ring chamfers of N338; an oversized radius locks the ring on its face and tilts the 78 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g N338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N338 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full N300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 78 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 78 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N338?",
        "a": "N338 is an NTN N single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N338 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N338 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n338",
      "N338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF338",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF338 appears as a 190 mm bore single-row cylindrical roller bearing (1080 kN C / 1260 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NF338 to its envelope: type code NF, series NF300, 190 mm bore; the 400×78 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 245 mm and Ew 345 mm — the envelope inside the 190/400 mm bore/OD where the rollers actually run. Mass 48300 g for the 190×400×78 mm NF338 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NF338 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NF338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 190 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF338 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 190 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF338?",
        "a": "NF338 is an NTN NF single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF338 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF338 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf338",
      "NF338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2338",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 190 mm shaft NTN supplies NJ2338: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,400 r/min on grease and 1,700 r/min on oil. Numbering ties NJ2338 to its envelope: type code NJ, series NJ2300, 190 mm bore; the 400×132 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NJ2338 designation when purchasing. Equivalent-load planning treats NJ2338 as a pure radial bearing: keep P below 1680 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 190 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g NJ2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2338 with a deep-groove ball bearing on rating alone: line contact gives 1680 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2220 kN pair here belongs to NJ2338 as printed, not to the bare size.",
      "Grease limiting speed 1,400 r/min and oil 1,700 r/min are different limits for NJ2338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 132 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2338?",
        "a": "NJ2338 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2338 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2338 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2338-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×400×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2338",
      "NJ2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ338",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ338 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 190×400×78 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 190 mm, with 400 mm OD and 78 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 245 mm and Ew 345 mm — the envelope inside the 190/400 mm bore/OD where the rollers actually run. The 5.7 kN-per-mm-bore figure (1080 kN over 190 mm) lets a NJ338 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NJ338; an oversized radius locks the ring on its face and tilts the 78 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NJ338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ338 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ338?",
        "a": "NJ338 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ338 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ338 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj338",
      "NJ338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2338",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2338 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 190×400×132 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NU2338 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 1680 kN C assumes clean oil and adequate film; the 196 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2338.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g NU2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 190 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 400×132 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2338 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,400 r/min and oil 1,700 r/min are different limits for NU2338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NU2338 with a deep-groove ball bearing on rating alone: line contact gives 1680 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2338?",
        "a": "NU2338 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2338 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2338 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2338-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×400×132 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2338",
      "NU2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU338",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU338 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1080 kN dynamic rating in the 190 mm bore. Numbering ties NU338 to its envelope: type code NU, series NU300, 190 mm bore; the 400×78 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 190 mm bore. Mass 48300 g for the 190×400×78 mm NU338 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NU338; an oversized radius locks the ring on its face and tilts the 78 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NU338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU338: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NU338 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU338?",
        "a": "NU338 is an NTN NU single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU338 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU338 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU338-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 190×400×78 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu338",
      "NU338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2338",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2220,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2338 on the 190×400 mm envelope, 132 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,400 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 190 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP2338. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 190 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 78900 g NUP2338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 400×132 mm envelope matches.",
      "The 132 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 190 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2220 kN pair here belongs to NUP2338 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 1680/2220 kN ratings, 196 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2338?",
        "a": "NUP2338 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2220 kN, Pu 196 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 78900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2338 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2338 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2338",
      "NUP2338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP338",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP338",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 78,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 48300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP338 is the standard section of the NTN NUP300 dimension series for a 190 mm shaft — 1080 kN of basic dynamic capacity in a 48300 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP338 floats or locates; the numeric remainder is the ISO 15 series and 190 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NUP338. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NUP338; grease-churn heating closes that gap as fill quantity rises. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 190 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 190 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 48300 g NUP338 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 190 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 190 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 400×78 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 1080/1260 kN ratings, 111 kN Pu and 48300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP338 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP338?",
        "a": "NUP338 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 78 mm width (7.48 × 15.748 × 3.071 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1260 kN, Pu 111 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 48300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP338 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP338 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP338 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP338?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm, Ew 345 mm. The nominal bore/OD remain 190/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP338",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup338",
      "NUP338"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4940",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4940",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 14000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN4940 on the 200×280 mm envelope, 80 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 2,100 r/min. Numbering ties NN4940 to its envelope: type code NN, series NN4900, 200 mm bore; the 280×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints the raceway diameters for this size — Fw 225 mm — the envelope inside the 200/280 mm bore/OD where the rollers actually run. The 200 mm (7.874 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN4940 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 14000 g NN4940 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN4940 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 40.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The 40.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 280×80 mm envelope matches.",
      "The 615/1180 kN ratings, 110 kN Pu and 14000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4940 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4940?",
        "a": "NN4940 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 80 mm width (7.874 × 11.024 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 1180 kN, Pu 110 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 14000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4940 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4940 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4940?",
        "a": "NN4940 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4940?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 225 mm. The nominal bore/OD remain 200/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4940",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4940",
      "NN4940"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4940K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4940K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 13300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN4940K denotes a 200×280×80 mm (7.874 × 11.024 × 3.15 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4940K floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 225 mm — the envelope inside the 200/280 mm bore/OD where the rollers actually run. Rating life at 615 kN C assumes clean oil and adequate film; the 110 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 13300 g NN4940K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NN4940K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 615/1180 kN pair here belongs to NN4940K as printed, not to the bare size.",
      "Open NN4940K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 280×80 mm envelope matches.",
      "The 615/1180 kN ratings, 110 kN Pu and 13300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4940K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4940K?",
        "a": "NN4940K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 80 mm width (7.874 × 11.024 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 1180 kN, Pu 110 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 13300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4940K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4940K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4940K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4940K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4940 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4940K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 225 mm. The nominal bore/OD remain 200/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4940K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4940k",
      "NN4940K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4940K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4940K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 615,
    "static_load_kN": 1180,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2400,
    "weight_g": 14000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4940K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 615 kN dynamic rating in the 200 mm bore. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The 80 mm width and 40.0 mm section put the NNU4900 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 200 mm (7.874 in) bore and 280 mm (11.024 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NNU4940K.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,400 r/min need positive flow and drain design; the 14000 g NNU4940K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 615/1180 kN pair here belongs to NNU4940K as printed, not to the bare size.",
      "Open NNU4940K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 615/1180 kN ratings, 110 kN Pu and 14000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4940K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4940K?",
        "a": "NNU4940K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 80 mm width (7.874 × 11.024 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 615 kN, C0 1180 kN, Pu 110 kN, grease limiting speed 2,100 r/min, oil 2,400 r/min, mass about 14000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4940K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4940K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4940K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4940K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4940 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4940K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 225 mm. The nominal bore/OD remain 200/280 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,100 r/min grease / 2,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4940K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4940k",
      "NNU4940K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1040",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 200 mm shaft NTN supplies N1040: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 2,200 r/min on grease and 2,600 r/min on oil. Digit by digit, N1040 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 229 mm and Ew 281 mm — the envelope inside the 200/310 mm bore/OD where the rollers actually run. Rating life at 430 kN C assumes clean oil and adequate film; the 53.5 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of N1040; an oversized radius locks the ring on its face and tilts the 51 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g N1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N1040 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open N1040 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The N rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "The N rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1040?",
        "a": "N1040 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1040 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1040 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1040",
      "N1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1040",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ1040 on the 200×310 mm envelope, 51 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,200 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 2.1 kN-per-mm-bore figure (430 kN over 200 mm) lets a NJ1040 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g NJ1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "If the shaft must be located both ways, do not use NJ1040 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NJ1040: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 430/580 kN pair here belongs to NJ1040 as printed, not to the bare size.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1040?",
        "a": "NJ1040 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1040 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1040 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1040",
      "NJ1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3040",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 725,
    "static_load_kN": 1170,
    "fatigue_load_limit_kN": 107,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2300,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3040 denotes a 200×310×82 mm (7.874 × 12.205 × 3.228 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 310 mm OD and 82 mm width from the ISO 15 general plan. The roller-set pitch sits inside the 55.0 mm radial section between the 200 mm bore and 310 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Equivalent-load planning treats NN3040 as a pure radial bearing: keep P below 725 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 21600 g NN3040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,900 r/min and oil 2,300 r/min are different limits for NN3040: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 310×82 mm envelope matches.",
      "The 725/1170 kN ratings, 107 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3040?",
        "a": "NN3040 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 725 kN, C0 1170 kN, Pu 107 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min, mass about 21600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3040 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3040?",
        "a": "NN3040 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3040?",
        "a": "NTN rates NN3040 at 1,900 r/min with grease and 2,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3040",
      "NN3040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3040K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3040K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 725,
    "static_load_kN": 1170,
    "fatigue_load_limit_kN": 107,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2300,
    "weight_g": 20800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3040K is the standard section of the NTN NN3000 dimension series for a 200 mm shaft — 725 kN of basic dynamic capacity in a 20800 g, open bearing. Numbering ties NN3040K to its envelope: type code NN, series NN3000, 200 mm bore; the 310×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 55.0 mm radial section ((310−200)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. Equivalent-load planning treats NN3040K as a pure radial bearing: keep P below 725 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 20800 g NN3040K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 200 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 310×82 mm envelope matches.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The 725/1170 kN ratings, 107 kN Pu and 20800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3040K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3040K?",
        "a": "NN3040K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 725 kN, C0 1170 kN, Pu 107 kN, grease limiting speed 1,900 r/min, oil 2,300 r/min, mass about 20800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3040K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3040K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3040K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3040K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3040 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3040K?",
        "a": "NTN rates NN3040K at 1,900 r/min with grease and 2,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3040K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3040k",
      "NN3040K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1040",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU1040 denotes a 200×310×51 mm (7.874 × 12.205 × 2.008 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 310 mm OD and 51 mm width from the ISO 15 general plan. With C 430 kN and C0 580 kN (C0/C ≈ 1.35) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. Speed ratio check: limiting 2,200 r/min is .85 of the 2,600 r/min oil value for NU1040; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g NU1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 51 mm-wide cavity.",
      "Open NU1040 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Grease limiting speed 2,200 r/min and oil 2,600 r/min are different limits for NU1040: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1040 skids at 2,200 r/min and fails by smearing long before L10 fatigue.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1040?",
        "a": "NU1040 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1040 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1040 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1040-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×310×51 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1040",
      "NU1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1040",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1040",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 430,
    "static_load_kN": 580,
    "fatigue_load_limit_kN": 53.5,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2600,
    "weight_g": 13700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP1040 denotes a 200×310×51 mm (7.874 × 12.205 × 2.008 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 310 mm OD and 51 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 229 mm and Ew 281 mm — the envelope inside the 200/310 mm bore/OD where the rollers actually run. Mass 13700 g for the 200×310×51 mm NUP1040 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 200 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,600 r/min need positive flow and drain design; the 13700 g NUP1040 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 55.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 51 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NUP1040 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NUP1040 with a deep-groove ball bearing on rating alone: line contact gives 430 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 310×51 mm envelope matches.",
      "The 430/580 kN ratings, 53.5 kN Pu and 13700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1040 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1040?",
        "a": "NUP1040 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 51 mm width (7.874 × 12.205 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 430 kN, C0 580 kN, Pu 53.5 kN, grease limiting speed 2,200 r/min, oil 2,600 r/min, mass about 13700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1040 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1040 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1040 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1040?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 229 mm, Ew 281 mm. The nominal bore/OD remain 200/310 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,200 r/min grease / 2,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1040",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1040",
      "NUP1040"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2240",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2240 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1020 kN dynamic rating in the 200 mm bore. On the NTN nameplate N states which ring carries the ribs, which determines whether N2240 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2240 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1020 kN C assumes clean oil and adequate film; the 129 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g N2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2240 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for N2240: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace N2240 with a deep-groove ball bearing on rating alone: line contact gives 1020 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full N2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2240?",
        "a": "N2240 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2240 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2240 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2240",
      "N2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N240",
    "brand": "NTN",
    "manufacturer_designation": "NTN N240",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N240 denotes a 200×360×58 mm (7.874 × 14.173 × 2.283 in) cylindrical roller bearing in the N200 family, a pressed sheet-steel cage. Digit by digit, N240 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N240. The 200 mm (7.874 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g N240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Open N240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N240?",
        "a": "N240 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N240 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N240 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n240",
      "N240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF240",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF240 appears as a 200 mm bore single-row cylindrical roller bearing (690 kN C / 865 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. With C 690 kN and C0 865 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,100 r/min for continuously high-duty 200 mm positions. Housing and shaft fillets must clear the ring chamfers of NF240; an oversized radius locks the ring on its face and tilts the 58 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NF240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NF240 with a deep-groove ball bearing on rating alone: line contact gives 690 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF240 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF240 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF240 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF240?",
        "a": "NF240 is an NTN NF single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF240 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF240 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf240",
      "NF240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2240",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 200 mm shaft NTN supplies NJ2240: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 98 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2240. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ2240.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g NJ2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NJ2240: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2240?",
        "a": "NJ2240 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2240 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2240 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×98 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2240",
      "NJ2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2240E",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1350,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2240E appears as a 200 mm bore single-row cylindrical roller bearing (1350 kN C / 1870 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. Digit by digit, NJ2240E reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Line contact between rollers and raceways gives NJ2240E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1350 kN C assumes clean oil and adequate film; the 167 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2240E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the NJ2240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 98 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1350/1870 kN pair here belongs to NJ2240E as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1350/1870 kN ratings, 167 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2240E?",
        "a": "NJ2240E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1350 kN, C0 1870 kN, Pu 167 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2240E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2240E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 241 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2240e",
      "NJ2240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ240",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ240 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 200×360×58 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ240. The 200 mm (7.874 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 58 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ240.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NJ240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 690/865 kN pair here belongs to NJ240 as printed, not to the bare size.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ240?",
        "a": "NJ240 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ240 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ240 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj240",
      "NJ240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ240E",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 850,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 95,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ240E is the standard section of the NTN NJ200 dimension series for a 200 mm shaft — 850 kN of basic dynamic capacity in a open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The 80.0 mm radial section ((360−200)/2) frames the roller complement; capacity per millimetre of bore is about 4.3 kN/mm before application factors. Rating life at 850 kN C assumes clean oil and adequate film; the 95 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ240E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NJ240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 850/1060 kN pair here belongs to NJ240E as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The 80.0 mm section at 200 mm bore leaves a narrow oil path; with the E high-capacity cage the relubrication groove and oil-level design must keep grease from churning in the 58 mm-wide cavity.",
      "The 850/1060 kN ratings, 95 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NJ240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ240E?",
        "a": "NJ240E is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 850 kN, C0 1060 kN, Pu 95 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ240E is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ240E take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 243 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj240e",
      "NJ240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2240",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2240 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 200×360×98 mm ISO 15 envelope. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The 98 mm width and 80.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 5.1 kN-per-mm-bore figure (1020 kN over 200 mm) lets a NU2240 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g NU2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU2240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NU2240: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 98 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Open NU2240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2240?",
        "a": "NU2240 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2240 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2240 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×98 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2240",
      "NU2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2240E",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1350,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2240E on the 200×360 mm envelope, 98 mm wide: a line-contact radial bearing with the high-capacity pressed-steel cage of the E execution and a grease limiting speed of 1,500 r/min. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 98 mm width from the ISO 15 general plan. The 98 mm width and 80.0 mm section put the NU2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,700 r/min for continuously high-duty 200 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 200 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the NU2240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1350/1870 kN pair here belongs to NU2240E as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NU2240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NU2240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NU2240E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "The 1350/1870 kN ratings, 167 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU2240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2240E?",
        "a": "NU2240E is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1350 kN, C0 1870 kN, Pu 167 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2240E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2240E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 241 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2240e",
      "NU2240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU240",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU240 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 690 kN dynamic rating in the 200 mm bore. Numbering ties NU240 to its envelope: type code NU, series NU200, 200 mm bore; the 360×58 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NU240 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NU240 as a pure radial bearing: keep P below 690 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU240.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NU240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 200 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 690/865 kN pair here belongs to NU240 as printed, not to the bare size.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Do not replace NU240 with a deep-groove ball bearing on rating alone: line contact gives 690 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU240?",
        "a": "NU240 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU240 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU240 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU240-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×360×58 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu240",
      "NU240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU240E",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 850,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 95,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU240E belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 850 kN dynamic rating in the 200 mm bore. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 243 mm — the envelope inside the 200/360 mm bore/OD where the rollers actually run. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (the high-capacity pressed-steel cage of the E execution) and oil-flow option to 1,900 r/min for continuously high-duty 200 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 200 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NU240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU240E with a deep-groove ball bearing on rating alone: line contact gives 850 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NU240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NU240E with a deep-groove ball bearing on rating alone: line contact gives 850 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 200 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 360×58 mm envelope matches.",
      "The 850/1060 kN ratings, 95 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NU240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU240E?",
        "a": "NU240E is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 850 kN, C0 1060 kN, Pu 95 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU240E is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU240E take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 243 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu240e",
      "NU240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2240",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1020,
    "static_load_kN": 1440,
    "fatigue_load_limit_kN": 129,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 40500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2240 on the 200×360 mm envelope, 98 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 244 mm and Ew 316 mm — the envelope inside the 200/360 mm bore/OD where the rollers actually run. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,900 r/min for continuously high-duty 200 mm positions. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 40500 g NUP2240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1020/1440 kN pair here belongs to NUP2240 as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 360×98 mm envelope matches.",
      "The 1020/1440 kN ratings, 129 kN Pu and 40500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2240?",
        "a": "NUP2240 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1020 kN, C0 1440 kN, Pu 129 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 40500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2240 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2240 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2240",
      "NUP2240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2240E",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1350,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2240E denotes a 200×360×98 mm (7.874 × 14.173 × 3.858 in) cylindrical roller bearing in the NUP2200 family, the high-capacity pressed-steel cage of the E execution. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2240E floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP2240E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 6.8 kN-per-mm-bore figure (1350 kN over 200 mm) lets a NUP2240E interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP2240E non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the NUP2240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2240E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "If the shaft must be located both ways, do not use NUP2240E alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NUP2240E units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1350/1870 kN ratings, 167 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2240E?",
        "a": "NUP2240E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1350 kN, C0 1870 kN, Pu 167 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2240E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2240E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 241 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2240e",
      "NUP2240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP240",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP240",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 690,
    "static_load_kN": 865,
    "fatigue_load_limit_kN": 77.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 24800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP240 is the standard section of the NTN NUP200 dimension series for a 200 mm shaft — 690 kN of basic dynamic capacity in a 24800 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP240 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP240 designation when purchasing. Thermal planning around the 1,800 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,100 r/min for continuously high-duty 200 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 24800 g NUP240 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP240 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Do not replace NUP240 with a deep-groove ball bearing on rating alone: line contact gives 690 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 58 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The 690/865 kN ratings, 77.5 kN Pu and 24800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP240 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP240?",
        "a": "NUP240 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 690 kN, C0 865 kN, Pu 77.5 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 24800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP240 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP240 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP240 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP240?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 244 mm, Ew 316 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP240",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup240",
      "NUP240"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP240E",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP240E",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 850,
    "static_load_kN": 1060,
    "fatigue_load_limit_kN": 95,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP240E appears as a 200 mm bore single-row cylindrical roller bearing (850 kN C / 1060 kN C0) with the high-capacity pressed-steel cage of the E execution, listed to the ISO 15 boundary plan. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 200 mm, with 360 mm OD and 58 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP240E high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NUP240E as a pure radial bearing: keep P below 850 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 200 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the NUP240E ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP240E with a deep-groove ball bearing on rating alone: line contact gives 850 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP240E skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 850/1060 kN ratings, 95 kN Pu are NTN Ball and Roller Bearings CAT.No.2203E values for NUP240E (E high-capacity execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP240E?",
        "a": "NUP240E is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 58 mm width (7.874 × 14.173 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 850 kN, C0 1060 kN, Pu 95 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min. It is open, with the high-capacity pressed-steel cage of the E execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP240E is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP240E is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP240E take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP240E?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 243 mm. The nominal bore/OD remain 200/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP240E",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup240e",
      "NUP240E"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2340",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2340 appears as a 200 mm bore single-row cylindrical roller bearing (1680 kN C / 2240 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N2340 designation when purchasing. Selection arithmetic: Pu 195 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.33 (2240/1680 kN) shows the high-static-capacity proportioning of this 200 mm bore. Heat the inner ring to max 120 °C for the 200 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g N2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2240 kN pair here belongs to N2340 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N2340 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1680/2240 kN pair here belongs to N2340 as printed, not to the bare size.",
      "The 138 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2340?",
        "a": "N2340 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2340 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2340 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2340",
      "N2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N340",
    "brand": "NTN",
    "manufacturer_designation": "NTN N340",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N340 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 200×420×80 mm ISO 15 envelope. Numbering ties N340 to its envelope: type code N, series N300, 200 mm bore; the 420×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1080 kN and C0 1270 kN (C0/C ≈ 1.18) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Rating life at 1080 kN C assumes clean oil and adequate film; the 111 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N340.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g N340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 420×80 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N340?",
        "a": "N340 is an NTN N single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N340 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N340 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n340",
      "N340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF340",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF340 is the standard section of the NTN NF300 dimension series for a 200 mm shaft — 1080 kN of basic dynamic capacity in a 54500 g, open bearing. On the NTN nameplate NF states which ring carries the ribs, which determines whether NF340 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 111 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.18 (1270/1080 kN) shows the high-static-capacity proportioning of this 200 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 200 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NF340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Do not replace NF340 with a deep-groove ball bearing on rating alone: line contact gives 1080 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 110.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1080/1270 kN pair here belongs to NF340 as printed, not to the bare size.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF340?",
        "a": "NF340 is an NTN NF single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF340 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF340 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf340",
      "NF340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2340",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2340 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1680 kN dynamic rating in the 200 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ2340 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. With C 1680 kN and C0 2240 kN (C0/C ≈ 1.33) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Speed ratio check: limiting 1,400 r/min is .88 of the 1,600 r/min oil value for NJ2340; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g NJ2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2340 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2340 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2340?",
        "a": "NJ2340 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2340 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2340 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×138 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2340",
      "NJ2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ340",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ340 on the 200×420 mm envelope, 80 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,500 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 200 mm (00–03 use the 10/12/15/17 exception table). The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 54500 g for the 200×420×80 mm NJ340 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ340.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NJ340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 200 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 420×80 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1080/1270 kN pair here belongs to NJ340 as printed, not to the bare size.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ340?",
        "a": "NJ340 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ340 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ340 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj340",
      "NJ340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2340",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2340 on the 200×420 mm envelope, 138 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,400 r/min. Numbering ties NU2340 to its envelope: type code NU, series NU2300, 200 mm bore; the 420×138 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU2340. The 200 mm (7.874 in) bore and 420 mm (16.535 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 138 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g NU2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NU2340 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NU2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2340?",
        "a": "NU2340 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2340 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2340 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×138 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2340",
      "NU2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU340",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU340 appears as a 200 mm bore single-row cylindrical roller bearing (1080 kN C / 1270 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU340 floats or locates; the numeric remainder is the ISO 15 series and 200 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 260 mm and Ew 360 mm — the envelope inside the 200/420 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 111 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.18 (1270/1080 kN) shows the high-static-capacity proportioning of this 200 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU340.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NU340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 200 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 200 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 420×80 mm envelope matches.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU340?",
        "a": "NU340 is an NTN NU single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU340 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU340 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU340-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 200×420×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu340",
      "NU340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2340",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1680,
    "static_load_kN": 2240,
    "fatigue_load_limit_kN": 195,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 90700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 200 mm shaft NTN supplies NUP2340: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. Numbering ties NUP2340 to its envelope: type code NUP, series NUP2300, 200 mm bore; the 420×138 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 1,600 r/min with oil versus 1,400 r/min with grease (a 200 r/min band), lubrication choice for NUP2340 is a thermal decision, not just a sealing one. The 8.4 kN-per-mm-bore figure (1680 kN over 200 mm) lets a NUP2340 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NUP2340; an oversized radius locks the ring on its face and tilts the 138 mm-wide seat.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 90700 g NUP2340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 200 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NUP2340 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 200 mm contact.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NUP2340: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1680/2240 kN ratings, 195 kN Pu and 90700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2340?",
        "a": "NUP2340 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1680 kN, C0 2240 kN, Pu 195 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 90700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2340 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2340 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2340",
      "NUP2340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP340",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP340",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1270,
    "fatigue_load_limit_kN": 111,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 54500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP340 denotes a 200×420×80 mm (7.874 × 16.535 × 3.15 in) cylindrical roller bearing in the NUP300 family, a pressed sheet-steel cage. Digit by digit, NUP340 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 200 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 1,800 r/min with oil versus 1,500 r/min with grease (a 300 r/min band), lubrication choice for NUP340 is a thermal decision, not just a sealing one. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 200 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 200 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 54500 g NUP340 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 200 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP340 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1080/1270 kN pair here belongs to NUP340 as printed, not to the bare size.",
      "Grease limiting speed 1,500 r/min and oil 1,800 r/min are different limits for NUP340: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1080/1270 kN ratings, 111 kN Pu and 54500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP340 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP340?",
        "a": "NUP340 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 80 mm width (7.874 × 16.535 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1270 kN, Pu 111 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 54500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP340 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP340 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP340 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP340?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 260 mm, Ew 360 mm. The nominal bore/OD remain 200/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP340",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup340",
      "NUP340"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4944",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4944",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 650,
    "static_load_kN": 1300,
    "fatigue_load_limit_kN": 118,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4944 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 650 kN dynamic rating in the 220 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4944 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Rating life at 650 kN C assumes clean oil and adequate film; the 118 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 15200 g NN4944 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4944 with a deep-groove ball bearing on rating alone: line contact gives 650 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 300 mm race brinells and releases as vibration within hours.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 650/1300 kN ratings, 118 kN Pu and 15200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4944 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4944?",
        "a": "NN4944 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 80 mm width (8.661 × 11.811 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 650 kN, C0 1300 kN, Pu 118 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 15200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4944 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4944 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4944?",
        "a": "NN4944 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4944?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm. The nominal bore/OD remain 220/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4944",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4944",
      "NN4944"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4944K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4944K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 650,
    "static_load_kN": 1300,
    "fatigue_load_limit_kN": 118,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 14500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4944K is the extra-light (10/49) section of the NTN NN4900 dimension series for a 220 mm shaft — 650 kN of basic dynamic capacity in a 14500 g, open bearing. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 300 mm OD and 80 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NN4944K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 3.0 kN-per-mm-bore figure (650 kN over 220 mm) lets a NN4944K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 220 mm shaft.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 14500 g NN4944K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4944K skids at 1,900 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NN4944K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 220 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 300×80 mm envelope matches.",
      "Do not replace NN4944K with a deep-groove ball bearing on rating alone: line contact gives 650 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 650/1300 kN ratings, 118 kN Pu and 14500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4944K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4944K?",
        "a": "NN4944K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 80 mm width (8.661 × 11.811 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 650 kN, C0 1300 kN, Pu 118 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 14500 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4944K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4944K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4944K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4944K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4944 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4944K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm. The nominal bore/OD remain 220/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4944K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4944k",
      "NN4944K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4944K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4944K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 650,
    "static_load_kN": 1300,
    "fatigue_load_limit_kN": 118,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2200,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies NNU4944K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,900 r/min on grease and 2,200 r/min on oil. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4944K floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. At 2,200 r/min with oil versus 1,900 r/min with grease (a 300 r/min band), lubrication choice for NNU4944K is a thermal decision, not just a sealing one. Mass 15200 g for the 220×300×80 mm NNU4944K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 220 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,200 r/min need positive flow and drain design; the 15200 g NNU4944K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NNU4944K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 40.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "The K tapered bore of NNU4944K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Grease limiting speed 1,900 r/min and oil 2,200 r/min are different limits for NNU4944K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 650/1300 kN ratings, 118 kN Pu and 15200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4944K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4944K?",
        "a": "NNU4944K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 80 mm width (8.661 × 11.811 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 650 kN, C0 1300 kN, Pu 118 kN, grease limiting speed 1,900 r/min, oil 2,200 r/min, mass about 15200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4944K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4944K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4944K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4944K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4944 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4944K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 245 mm. The nominal bore/OD remain 220/300 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,900 r/min grease / 2,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4944K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4944k",
      "NNU4944K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1044",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1044 appears as a 220 mm bore single-row cylindrical roller bearing (555 kN C / 750 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 340 mm OD and 56 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1044 designation when purchasing. Thermal planning around the 2,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 2,300 r/min for continuously high-duty 220 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 220 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g N1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "Open N1044 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 220 mm contact.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1044?",
        "a": "N1044 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1044 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1044 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1044",
      "N1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1044",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1044 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 555 kN dynamic rating in the 220 mm bore. Numbering ties NJ1044 to its envelope: type code NJ, series NJ1000, 220 mm bore; the 340×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 555 kN and C0 750 kN (C0/C ≈ 1.35) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1044.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g NJ1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/750 kN pair here belongs to NJ1044 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ1044 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1044?",
        "a": "NJ1044 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1044 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1044 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1044-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1044",
      "NJ1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3044",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 905,
    "static_load_kN": 1480,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 29300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3044 on the 220×340 mm envelope, 90 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,700 r/min. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 220 mm (8.661 in) bore and 340 mm (13.386 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 90 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3044 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 29300 g NN3044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 905/1480 kN pair here belongs to NN3044 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 90 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 905/1480 kN ratings, 132 kN Pu and 29300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3044?",
        "a": "NN3044 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 905 kN, C0 1480 kN, Pu 132 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 29300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3044 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3044?",
        "a": "NN3044 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3044?",
        "a": "NTN rates NN3044 at 1,700 r/min with grease and 2,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3044",
      "NN3044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3044K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3044K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 905,
    "static_load_kN": 1480,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 28200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3044K appears as a 220 mm bore single-row cylindrical roller bearing (905 kN C / 1480 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Digit by digit, NN3044K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The roller-set pitch sits inside the 60.0 mm radial section between the 220 mm bore and 340 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Selection arithmetic: Pu 132 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.64 (1480/905 kN) shows the high-static-capacity proportioning of this 220 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3044K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 28200 g NN3044K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,700 r/min and oil 2,100 r/min are different limits for NN3044K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 905/1480 kN pair here belongs to NN3044K as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 220 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 340×90 mm envelope matches.",
      "The 905/1480 kN ratings, 132 kN Pu and 28200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3044K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3044K?",
        "a": "NN3044K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 905 kN, C0 1480 kN, Pu 132 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 28200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3044K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3044K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3044K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3044K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3044 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3044K?",
        "a": "NTN rates NN3044K at 1,700 r/min with grease and 2,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3044K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3044k",
      "NN3044K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1044",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU1044 on the 220×340 mm envelope, 56 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1044. Equivalent-load planning treats NU1044 as a pure radial bearing: keep P below 555 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1044 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g NU1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1044 skids at 2,000 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NU1044 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 340 mm race brinells and releases as vibration within hours.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1044?",
        "a": "NU1044 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1044 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1044 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1044-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×340×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1044",
      "NU1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1044",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1044",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 555,
    "static_load_kN": 750,
    "fatigue_load_limit_kN": 67,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2300,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP1044 on the 220×340 mm envelope, 56 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 2,000 r/min. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1044 designation when purchasing. The 2.5 kN-per-mm-bore figure (555 kN over 220 mm) lets a NUP1044 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Heat the inner ring to max 120 °C for the 220 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 2,300 r/min need positive flow and drain design; the 17900 g NUP1044 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 555/750 kN pair here belongs to NUP1044 as printed, not to the bare size.",
      "Grease limiting speed 2,000 r/min and oil 2,300 r/min are different limits for NUP1044: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 555/750 kN ratings, 67 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1044 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1044?",
        "a": "NUP1044 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 56 mm width (8.661 × 13.386 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 555 kN, C0 750 kN, Pu 67 kN, grease limiting speed 2,000 r/min, oil 2,300 r/min, mass about 17900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1044 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1044 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1044 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1044?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 250 mm, Ew 310 mm. The nominal bore/OD remain 220/340 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 2,000 r/min grease / 2,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1044",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1044",
      "NUP1044"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2244",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2244 is the wide (22) section of the NTN N2200 dimension series for a 220 mm shaft — 1260 kN of basic dynamic capacity in a 57800 g, open bearing. Digit by digit, N2244 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,700 r/min for continuously high-duty 220 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2244.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g N2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for N2244: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use N2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for N2244: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1260/1810 kN pair here belongs to N2244 as printed, not to the bare size.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2244?",
        "a": "N2244 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2244 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2244 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2244",
      "N2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N244",
    "brand": "NTN",
    "manufacturer_designation": "NTN N244",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N244 on the 220×400 mm envelope, 65 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 400 mm OD and 65 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Rating life at 845 kN C assumes clean oil and adequate film; the 94 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N244.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g N244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "If the shaft must be located both ways, do not use N244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N244?",
        "a": "N244 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N244 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N244 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n244",
      "N244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF244",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NF244 denotes a 220×400×65 mm (8.661 × 15.748 × 2.559 in) cylindrical roller bearing in the NF200 family, a pressed sheet-steel cage. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF244. Selection arithmetic: Pu 94 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.28 (1080/845 kN) shows the high-static-capacity proportioning of this 220 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 220 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NF244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NF244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NF244 with a deep-groove ball bearing on rating alone: line contact gives 845 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NF244 with a deep-groove ball bearing on rating alone: line contact gives 845 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF244?",
        "a": "NF244 is an NTN NF single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF244 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF244 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf244",
      "NF244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2244",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2244 appears as a 220 mm bore single-row cylindrical roller bearing (1260 kN C / 1810 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,500 r/min grease and 1,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Speed ratio check: limiting 1,500 r/min is .88 of the 1,700 r/min oil value for NJ2244; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g NJ2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NJ2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2244?",
        "a": "NJ2244 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2244 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2244 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2244",
      "NJ2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ244",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies NJ244: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,600 r/min on grease and 1,900 r/min on oil. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 220 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,600 r/min grease and 1,900 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Rating life at 845 kN C assumes clean oil and adequate film; the 94 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NJ244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ244?",
        "a": "NJ244 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ244 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ244 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj244",
      "NJ244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2244",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies NU2244: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,500 r/min on grease and 1,700 r/min on oil. Numbering ties NU2244 to its envelope: type code NU, series NU2200, 220 mm bore; the 400×108 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 90.0 mm radial section ((400−220)/2) frames the roller complement; capacity per millimetre of bore is about 5.7 kN/mm before application factors. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Housing and shaft fillets must clear the ring chamfers of NU2244; an oversized radius locks the ring on its face and tilts the 108 mm-wide seat.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g NU2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2244 with a deep-groove ball bearing on rating alone: line contact gives 1260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NU2244 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2244?",
        "a": "NU2244 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2244 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2244 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×108 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2244",
      "NU2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU244",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU244 is the standard section of the NTN NU200 dimension series for a 220 mm shaft — 845 kN of basic dynamic capacity in a 37000 g, open bearing. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU244 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU244 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 220 mm (8.661 in) bore and 400 mm (15.748 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 65 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NU244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 90.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU244?",
        "a": "NU244 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU244 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU244 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu244",
      "NU244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2244",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1260,
    "static_load_kN": 1810,
    "fatigue_load_limit_kN": 157,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 57800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2244 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1260 kN dynamic rating in the 220 mm bore. Numbering ties NUP2244 to its envelope: type code NUP, series NUP2200, 220 mm bore; the 400×108 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2244 designation when purchasing. Selection arithmetic: Pu 157 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.44 (1810/1260 kN) shows the high-static-capacity proportioning of this 220 mm bore. Housing and shaft fillets must clear the ring chamfers of NUP2244; an oversized radius locks the ring on its face and tilts the 108 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 57800 g NUP2244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP2244 with a deep-groove ball bearing on rating alone: line contact gives 1260 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 1260/1810 kN ratings, 157 kN Pu and 57800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2244?",
        "a": "NUP2244 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1260 kN, C0 1810 kN, Pu 157 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 57800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2244 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2244 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2244",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2244",
      "NUP2244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP244",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP244",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 845,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 94,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 37000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP244 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 220×400×65 mm ISO 15 envelope. Digit by digit, NUP244 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP244 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 94 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.28 (1080/845 kN) shows the high-static-capacity proportioning of this 220 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP244 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 37000 g NUP244 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP244 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 220 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP244 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,600 r/min and oil 1,900 r/min are different limits for NUP244: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NUP244 with a deep-groove ball bearing on rating alone: line contact gives 845 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 845/1080 kN ratings, 94 kN Pu and 37000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP244 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP244?",
        "a": "NUP244 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 65 mm width (8.661 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 845 kN, C0 1080 kN, Pu 94 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 37000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP244 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP244 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP244 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP244?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 350 mm. The nominal bore/OD remain 220/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP244-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup244",
      "NUP244"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2344",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N2344 denotes a 220×460×145 mm (8.661 × 18.11 × 5.709 in) cylindrical roller bearing in the N2300 family, a pressed sheet-steel cage. Numbering ties N2344 to its envelope: type code N, series N2300, 220 mm bore; the 460×145 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2344 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 114000 g for the 220×460×145 mm N2344 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N2344.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g N2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 120.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 145 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1970/2620 kN pair here belongs to N2344 as printed, not to the bare size.",
      "The 145 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "Do not replace N2344 with a deep-groove ball bearing on rating alone: line contact gives 1970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2344?",
        "a": "N2344 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2344 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2344 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2344",
      "N2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N344",
    "brand": "NTN",
    "manufacturer_designation": "NTN N344",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 220 mm shaft NTN supplies N344: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N344 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N344. Thermal planning around the 1,400 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,600 r/min for continuously high-duty 220 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g N344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N344 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace N344 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace N344 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N344?",
        "a": "N344 is an NTN N single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N344 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N344 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n344",
      "N344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF344",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF344 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 220×460×88 mm ISO 15 envelope. Digit by digit, NF344 reads as NF (one rib on each ring), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1320 kN and C0 1570 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. Mass 71700 g for the 220×460×88 mm NF344 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 220 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NF344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NF344: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF344 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF344?",
        "a": "NF344 is an NTN NF single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF344 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF344 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf344",
      "NF344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2344",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2344 is the extra-wide (23) section of the NTN NJ2300 dimension series for a 220 mm shaft — 1970 kN of basic dynamic capacity in a 114000 g, open bearing. Digit by digit, NJ2344 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2344. Equivalent-load planning treats NJ2344 as a pure radial bearing: keep P below 1970 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2344 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NJ2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2344 with a deep-groove ball bearing on rating alone: line contact gives 1970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2344?",
        "a": "NJ2344 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2344 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2344 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2344",
      "NJ2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ344",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ344 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1320 kN dynamic rating in the 220 mm bore. Numbering ties NJ344 to its envelope: type code NJ, series NJ300, 220 mm bore; the 460×88 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1320 kN and C0 1570 kN (C0/C ≈ 1.19) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. The 6.0 kN-per-mm-bore figure (1320 kN over 220 mm) lets a NJ344 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NJ344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NJ300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 120.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 88 mm-wide cavity.",
      "Open NJ344 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 220 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ344 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ344?",
        "a": "NJ344 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ344 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ344 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ344-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj344",
      "NJ344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2344",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2344 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1970 kN dynamic rating in the 220 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2344 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 220 mm bore. Rating life at 1970 kN C assumes clean oil and adequate film; the 222 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NU2344; an oversized radius locks the ring on its face and tilts the 145 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NU2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 220 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1970/2620 kN pair here belongs to NU2344 as printed, not to the bare size.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 220 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "If the shaft must be located both ways, do not use NU2344 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2344?",
        "a": "NU2344 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2344 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2344 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2344-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 220×460×145 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2344",
      "NU2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU344",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU344 denotes a 220×460×88 mm (8.661 × 18.11 × 3.465 in) cylindrical roller bearing in the NU300 family, a pressed sheet-steel cage. Digit by digit, NU344 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 220 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU344 designation when purchasing. Mass 71700 g for the 220×460×88 mm NU344 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 220 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NU344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 220 mm bore share bore but not OD/width; check the full NU300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 120.0 mm section at 220 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 88 mm-wide cavity.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 220 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×88 mm envelope matches.",
      "The 88 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU344?",
        "a": "NU344 is an NTN NU single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU344 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU344 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU344-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu344",
      "NU344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2344",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1970,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 222,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2344 appears as a 220 mm bore single-row cylindrical roller bearing (1970 kN C / 2620 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2344 floats or locates; the numeric remainder is the ISO 15 series and 220 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 284 mm and Ew 396 mm — the envelope inside the 220/460 mm bore/OD where the rollers actually run. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 220 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NUP2344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2344 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×145 mm envelope matches.",
      "The 1970/2620 kN ratings, 222 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2344?",
        "a": "NUP2344 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1970 kN, C0 2620 kN, Pu 222 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2344 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2344 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2344",
      "NUP2344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP344",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP344",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 133,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 71700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP344 on the 220×460 mm envelope, 88 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,400 r/min. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 220 mm, with 460 mm OD and 88 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 284 mm and Ew 396 mm — the envelope inside the 220/460 mm bore/OD where the rollers actually run. Speed ratio check: limiting 1,400 r/min is .88 of the 1,600 r/min oil value for NUP344; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP344 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 220 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 71700 g NUP344 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Do not replace NUP344 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 88 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 220 mm inner ring.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 220 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 460×88 mm envelope matches.",
      "The 1320/1570 kN ratings, 133 kN Pu and 71700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP344 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP344?",
        "a": "NUP344 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 88 mm width (8.661 × 18.11 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1570 kN, Pu 133 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 71700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP344 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP344 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP344 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP344?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 284 mm, Ew 396 mm. The nominal bore/OD remain 220/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP344",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=153",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup344",
      "NUP344"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4948",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4948",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 680,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 126,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 16400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4948 is the extra-light (10/49) section of the NTN NN4900 dimension series for a 240 mm shaft — 680 kN of basic dynamic capacity in a 16400 g, open bearing. Digit by digit, NN4948 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NN4948 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 1,700 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 2,000 r/min for continuously high-duty 240 mm positions. Housing and shaft fillets must clear the ring chamfers of NN4948; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 16400 g NN4948 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4948 does not substitute a precision-class execution.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NN4948 with a deep-groove ball bearing on rating alone: line contact gives 680 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 680/1410 kN ratings, 126 kN Pu and 16400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4948 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4948?",
        "a": "NN4948 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 80 mm width (9.449 × 12.598 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 680 kN, C0 1410 kN, Pu 126 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 16400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4948 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4948 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4948?",
        "a": "NN4948 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4948?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 265 mm. The nominal bore/OD remain 240/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4948",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4948",
      "NN4948"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4948K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4948K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 680,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 126,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 15600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4948K appears as a 240 mm bore single-row cylindrical roller bearing (680 kN C / 1410 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN4948K to its envelope: type code NN, series NN4900, 240 mm bore; the 320×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 240 mm (9.449 in) bore and 320 mm (12.598 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NN4948K; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 15600 g NN4948K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4948K skids at 1,700 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 680/1410 kN pair here belongs to NN4948K as printed, not to the bare size.",
      "The 680/1410 kN ratings, 126 kN Pu and 15600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4948K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4948K?",
        "a": "NN4948K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 80 mm width (9.449 × 12.598 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 680 kN, C0 1410 kN, Pu 126 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 15600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4948K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4948K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4948K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4948K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4948 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4948K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 265 mm. The nominal bore/OD remain 240/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4948K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4948k",
      "NN4948K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4948K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4948K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 680,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 126,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2000,
    "weight_g": 16400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NNU4948K on the 240×320 mm envelope, 80 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,700 r/min. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 320 mm OD and 80 mm width from the ISO 15 general plan. Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Equivalent-load planning treats NNU4948K as a pure radial bearing: keep P below 680 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 240 mm shaft.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,000 r/min need positive flow and drain design; the 16400 g NNU4948K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NNU4948K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 680/1410 kN pair here belongs to NNU4948K as printed, not to the bare size.",
      "Grease limiting speed 1,700 r/min and oil 2,000 r/min are different limits for NNU4948K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 680/1410 kN ratings, 126 kN Pu and 16400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4948K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4948K?",
        "a": "NNU4948K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 80 mm width (9.449 × 12.598 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 680 kN, C0 1410 kN, Pu 126 kN, grease limiting speed 1,700 r/min, oil 2,000 r/min, mass about 16400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4948K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4948K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4948K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4948K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4948 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4948K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 265 mm. The nominal bore/OD remain 240/320 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,700 r/min grease / 2,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4948K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4948k",
      "NNU4948K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1048",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N1048 denotes a 240×360×56 mm (9.449 × 14.173 × 2.205 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 72 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.40 (820/585 kN) shows the high-static-capacity proportioning of this 240 mm bore. Heat the inner ring to max 120 °C for the 240 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g N1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Do not replace N1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1048 skids at 1,800 r/min and fails by smearing long before L10 fatigue.",
      "Do not replace N1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1048?",
        "a": "N1048 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1048 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1048 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1048",
      "N1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1048",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1048 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 240 mm shaft — 585 kN of basic dynamic capacity in a 19300 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1048 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1048. Speed ratio check: limiting 1,800 r/min is .86 of the 2,100 r/min oil value for NJ1048; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g NJ1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,800 r/min and oil 2,100 r/min are different limits for NJ1048: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/820 kN pair here belongs to NJ1048 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1048?",
        "a": "NJ1048 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1048 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1048 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1048",
      "NJ1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3048",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 945,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 140,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 32800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 945 kN dynamic rating in the 240 mm bore. Numbering ties NN3048 to its envelope: type code NN, series NN3000, 240 mm bore; the 360×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 945 kN C assumes clean oil and adequate film; the 140 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 32800 g NN3048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 60.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NN3048 with a deep-groove ball bearing on rating alone: line contact gives 945 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 945/1600 kN ratings, 140 kN Pu and 32800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3048?",
        "a": "NN3048 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 945 kN, C0 1600 kN, Pu 140 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 32800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3048 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3048?",
        "a": "NN3048 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3048?",
        "a": "NTN rates NN3048 at 1,600 r/min with grease and 1,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3048",
      "NN3048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3048K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3048K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 945,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 140,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 31600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3048K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 945 kN dynamic rating in the 240 mm bore. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded NN3048K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for NN3048K; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 31600 g NN3048K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3048K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 92 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The K tapered bore of NN3048K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Do not replace NN3048K with a deep-groove ball bearing on rating alone: line contact gives 945 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 945/1600 kN ratings, 140 kN Pu and 31600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3048K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3048K?",
        "a": "NN3048K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 945 kN, C0 1600 kN, Pu 140 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 31600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3048K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3048K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3048K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3048K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3048 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3048K?",
        "a": "NTN rates NN3048K at 1,600 r/min with grease and 1,900 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3048K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3048k",
      "NN3048K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1048",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 585 kN dynamic rating in the 240 mm bore. Numbering ties NU1048 to its envelope: type code NU, series NU1000, 240 mm bore; the 360×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,800 r/min grease and 2,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. The 240 mm (9.449 in) bore and 360 mm (14.173 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 56 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g NU1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU1048 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Do not replace NU1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 585/820 kN pair here belongs to NU1048 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NU1048 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1048?",
        "a": "NU1048 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1048 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1048 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1048-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×360×56 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1048",
      "NU1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1048",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1048",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 585,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 72,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2100,
    "weight_g": 19300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1048 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 585 kN dynamic rating in the 240 mm bore. Numbering ties NUP1048 to its envelope: type code NUP, series NUP1000, 240 mm bore; the 360×56 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1048 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1048.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 2,100 r/min need positive flow and drain design; the 19300 g NUP1048 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP1048 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 56 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "If the shaft must be located both ways, do not use NUP1048 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NUP1048 with a deep-groove ball bearing on rating alone: line contact gives 585 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 585/820 kN ratings, 72 kN Pu and 19300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1048 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1048?",
        "a": "NUP1048 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 56 mm width (9.449 × 14.173 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 585 kN, C0 820 kN, Pu 72 kN, grease limiting speed 1,800 r/min, oil 2,100 r/min, mass about 19300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1048 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1048 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1048 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1048?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 270 mm, Ew 330 mm. The nominal bore/OD remain 240/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,800 r/min grease / 2,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1048",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1048",
      "NUP1048"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2248",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2248 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 240×440×120 mm ISO 15 envelope. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 440 mm OD and 120 mm width from the ISO 15 general plan. With C 1590 kN and C0 2320 kN (C0/C ≈ 1.46) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Selection arithmetic: Pu 196 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.46 (2320/1590 kN) shows the high-static-capacity proportioning of this 240 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g N2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to N2248 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to N2248 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N2248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2248 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2248?",
        "a": "N2248 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2248 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2248 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2248",
      "N2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N248",
    "brand": "NTN",
    "manufacturer_designation": "NTN N248",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N248 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1040 kN dynamic rating in the 240 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). The 72 mm width and 100.0 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,700 r/min for continuously high-duty 240 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g N248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 440×72 mm envelope matches.",
      "Do not replace N248 with a deep-groove ball bearing on rating alone: line contact gives 1040 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "Open N248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N248?",
        "a": "N248 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N248 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N248 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n248",
      "N248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF248",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NF248 on the 240×440 mm envelope, 72 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,500 r/min. Numbering ties NF248 to its envelope: type code NF, series NF200, 240 mm bore; the 440×72 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,500 r/min grease and 1,700 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. Mass 49200 g for the 240×440×72 mm NF248 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 240 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NF248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 72 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NF248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NF248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NF248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF248?",
        "a": "NF248 is an NTN NF single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF248 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF248 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf248",
      "NF248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2248",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ2248 denotes a 240×440×120 mm (9.449 × 17.323 × 4.724 in) cylindrical roller bearing in the NJ2200 family, a pressed sheet-steel cage. Numbering ties NJ2248 to its envelope: type code NJ, series NJ2200, 240 mm bore; the 440×120 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 120 mm width and 100.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NJ2248 as a pure radial bearing: keep P below 1590 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2248 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g NJ2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to NJ2248 as printed, not to the bare size.",
      "Open NJ2248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2248?",
        "a": "NJ2248 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2248 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2248 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2248",
      "NJ2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ248",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ248 appears as a 240 mm bore single-row cylindrical roller bearing (1040 kN C / 1340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ248 to its envelope: type code NJ, series NJ200, 240 mm bore; the 440×72 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 72 mm width and 100.0 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,700 r/min for continuously high-duty 240 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ248 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NJ248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NJ248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 100.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NJ200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NJ248 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ248?",
        "a": "NJ248 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ248 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ248 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj248",
      "NJ248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2248",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU2248 appears as a 240 mm bore single-row cylindrical roller bearing (1590 kN C / 2320 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2248 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. At 1,600 r/min with oil versus 1,300 r/min with grease (a 300 r/min band), lubrication choice for NU2248 is a thermal decision, not just a sealing one. Speed ratio check: limiting 1,300 r/min is .81 of the 1,600 r/min oil value for NU2248; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 240 mm shaft.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g NU2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU2248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2320 kN pair here belongs to NU2248 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,300 r/min and oil 1,600 r/min are different limits for NU2248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2248?",
        "a": "NU2248 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2248 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2248 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2248",
      "NU2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU248",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU248 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 240×440×72 mm ISO 15 envelope. Digit by digit, NU248 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Rating life at 1040 kN C assumes clean oil and adequate film; the 113 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU248 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NU248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,500 r/min and oil 1,700 r/min are different limits for NU248: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 100.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 72 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1040/1340 kN pair here belongs to NU248 as printed, not to the bare size.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU248?",
        "a": "NU248 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU248 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU248 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu248",
      "NU248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2248",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2320,
    "fatigue_load_limit_kN": 196,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 78400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2248 is the wide (22) section of the NTN NUP2200 dimension series for a 240 mm shaft — 1590 kN of basic dynamic capacity in a 78400 g, open bearing. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2248 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2248 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 78400 g for the 240×440×120 mm NUP2248 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 240 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 78400 g NUP2248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP2248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 440×120 mm envelope matches.",
      "The 100.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 120 mm-wide cavity.",
      "Do not replace NUP2248 with a deep-groove ball bearing on rating alone: line contact gives 1590 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1590/2320 kN ratings, 196 kN Pu and 78400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2248?",
        "a": "NUP2248 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2320 kN, Pu 196 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 78400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2248 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2248 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2248",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2248",
      "NUP2248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP248",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP248",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 72,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1040,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 49200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 240 mm shaft NTN supplies NUP248: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,500 r/min on grease and 1,700 r/min on oil. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 440 mm OD and 72 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP248 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 49200 g for the 240×440×72 mm NUP248 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 49200 g NUP248 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP248 with a deep-groove ball bearing on rating alone: line contact gives 1040 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NUP248 with a deep-groove ball bearing on rating alone: line contact gives 1040 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NUP248 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1040/1340 kN ratings, 113 kN Pu and 49200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP248 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP248?",
        "a": "NUP248 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 72 mm width (9.449 × 17.323 × 2.835 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1040 kN, C0 1340 kN, Pu 113 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 49200 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP248 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP248 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP248 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP248?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 295 mm, Ew 385 mm. The nominal bore/OD remain 240/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP248-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup248",
      "NUP248"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2348",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2348 on the 240×500 mm envelope, 155 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. On the NTN nameplate N states which ring carries the ribs, which determines whether N2348 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2348 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 9.7 kN-per-mm-bore figure (2330 kN over 240 mm) lets a N2348 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 240 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g N2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 155 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 130.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 155 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2348?",
        "a": "N2348 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2348 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2348 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2348",
      "N2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N348",
    "brand": "NTN",
    "manufacturer_designation": "NTN N348",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N348 appears as a 240 mm bore single-row cylindrical roller bearing (1590 kN C / 1950 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, N348 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,300 r/min grease and 1,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. Selection arithmetic: Pu 160 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.23 (1950/1590 kN) shows the high-static-capacity proportioning of this 240 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N348 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g N348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for N348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for N348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for N348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use N348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N348?",
        "a": "N348 is an NTN N single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N348 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N348 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n348",
      "N348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF348",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 240 mm shaft NTN supplies NF348: one integral rib on each ring; the open execution is rated 1,300 r/min on grease and 1,500 r/min on oil. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 500 mm OD and 95 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF348. The 6.6 kN-per-mm-bore figure (1590 kN over 240 mm) lets a NF348 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF348.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NF348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 240 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 500×95 mm envelope matches.",
      "If the shaft must be located both ways, do not use NF348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 240 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF348?",
        "a": "NF348 is an NTN NF single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF348 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF348 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf348",
      "NF348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2348",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2348 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 240×500×155 mm ISO 15 envelope. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 500 mm OD and 155 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 240 mm bore. The 240 mm (9.449 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 155 mm-wide ring. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g NJ2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ2348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 500×155 mm envelope matches.",
      "Open NJ2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "If the shaft must be located both ways, do not use NJ2348 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2348?",
        "a": "NJ2348 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2348 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2348 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2348",
      "NJ2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ348",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ348 is the standard section of the NTN NJ300 dimension series for a 240 mm shaft — 1590 kN of basic dynamic capacity in a 91300 g, open bearing. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ348 floats or locates; the numeric remainder is the ISO 15 series and 240 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ348. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ348 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NJ348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ348 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ348?",
        "a": "NJ348 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ348 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ348 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ348-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj348",
      "NJ348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2348",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2348 is the extra-wide (23) section of the NTN NU2300 dimension series for a 240 mm shaft — 2330 kN of basic dynamic capacity in a 144000 g, open bearing. Digit by digit, NU2348 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 155 mm width and 130.0 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,300 r/min for continuously high-duty 240 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 240 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g NU2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2348 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 155 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "Open NU2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Open NU2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2348?",
        "a": "NU2348 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2348 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2348 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2348-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 240×500×155 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2348",
      "NU2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU348",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU348 on the 240×500 mm envelope, 95 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,300 r/min. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 240 mm, with 500 mm OD and 95 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU348 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 6.6 kN-per-mm-bore figure (1590 kN over 240 mm) lets a NU348 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU348 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NU348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "Open NU348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Do not replace NU348 with a deep-groove ball bearing on rating alone: line contact gives 1590 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU348?",
        "a": "NU348 is an NTN NU single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU348 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU348 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU348-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu348",
      "NU348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2348",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2330,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 262,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2348 denotes a 240×500×155 mm (9.449 × 19.685 × 6.102 in) cylindrical roller bearing in the NUP2300 family, a pressed sheet-steel cage. Digit by digit, NUP2348 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 240 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2348 designation when purchasing. Speed ratio check: limiting 1,100 r/min is .85 of the 1,300 r/min oil value for NUP2348; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 240 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 144000 g NUP2348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP2348 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP2348 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 240 mm contact.",
      "Do not replace NUP2348 with a deep-groove ball bearing on rating alone: line contact gives 2330 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 155 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 2330/3200 kN ratings, 262 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2348?",
        "a": "NUP2348 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2330 kN, C0 3200 kN, Pu 262 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 144000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2348 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2348 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2348",
      "NUP2348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP348",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP348",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 95,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 1950,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 91300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP348 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1590 kN dynamic rating in the 240 mm bore. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 240 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP348 designation when purchasing. Equivalent-load planning treats NUP348 as a pure radial bearing: keep P below 1590 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 240 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 91300 g NUP348 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 240 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 500×95 mm envelope matches.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for NUP348: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 130.0 mm section at 240 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 95 mm-wide cavity.",
      "The 95 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 240 mm inner ring.",
      "The 1590/1950 kN ratings, 160 kN Pu and 91300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP348 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP348?",
        "a": "NUP348 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 95 mm width (9.449 × 19.685 × 3.74 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 1950 kN, Pu 160 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 91300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP348 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP348 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP348 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP348?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 310 mm, Ew 430 mm. The nominal bore/OD remain 240/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP348",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup348",
      "NUP348"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4952",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4952",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1800,
    "weight_g": 28300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4952 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 260×360×100 mm ISO 15 envelope. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4952 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN4952; an oversized radius locks the ring on its face and tilts the 100 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 28300 g NN4952 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,600 r/min and oil 1,800 r/min are different limits for NN4952: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 50.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 260 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 360×100 mm envelope matches.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1000/2070 kN ratings, 179 kN Pu and 28300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4952 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4952?",
        "a": "NN4952 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 100 mm width (10.236 × 14.173 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 2070 kN, Pu 179 kN, grease limiting speed 1,600 r/min, oil 1,800 r/min, mass about 28300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4952 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4952 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4952?",
        "a": "NN4952 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4952?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 292 mm. The nominal bore/OD remain 260/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4952",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4952",
      "NN4952"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4952K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4952K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1800,
    "weight_g": 27000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4952K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1000 kN dynamic rating in the 260 mm bore. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 360 mm OD and 100 mm width from the ISO 15 general plan. At 1,800 r/min with oil versus 1,600 r/min with grease (a 200 r/min band), lubrication choice for NN4952K is a thermal decision, not just a sealing one. Speed ratio check: limiting 1,600 r/min is .89 of the 1,800 r/min oil value for NN4952K; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN4952K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 27000 g NN4952K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1000/2070 kN pair here belongs to NN4952K as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1000/2070 kN pair here belongs to NN4952K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 360 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,600 r/min and oil 1,800 r/min are different limits for NN4952K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1000/2070 kN ratings, 179 kN Pu and 27000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4952K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4952K?",
        "a": "NN4952K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 100 mm width (10.236 × 14.173 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 2070 kN, Pu 179 kN, grease limiting speed 1,600 r/min, oil 1,800 r/min, mass about 27000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4952K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4952K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4952K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4952K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4952 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4952K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 292 mm. The nominal bore/OD remain 260/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4952K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4952k",
      "NN4952K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4952K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4952K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1000,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 179,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1800,
    "weight_g": 28300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4952K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 260×360×100 mm ISO 15 envelope. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4952K floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,600 r/min grease and 1,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NNU arrangements. On NNU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 28300 g NNU4952K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 50.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NNU4952K with a deep-groove ball bearing on rating alone: line contact gives 1000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The K tapered bore of NNU4952K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 1000/2070 kN ratings, 179 kN Pu and 28300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4952K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4952K?",
        "a": "NNU4952K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 100 mm width (10.236 × 14.173 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1000 kN, C0 2070 kN, Pu 179 kN, grease limiting speed 1,600 r/min, oil 1,800 r/min, mass about 28300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4952K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4952K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4952K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4952K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4952 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4952K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 292 mm. The nominal bore/OD remain 260/360 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4952K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4952k",
      "NNU4952K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1052",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N1052 on the 260×400 mm envelope, 65 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,600 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 400 mm OD and 65 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1052 designation when purchasing. Speed ratio check: limiting 1,600 r/min is .84 of the 1,900 r/min oil value for N1052; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 260 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g N1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "Open N1052 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "Do not replace N1052 with a deep-groove ball bearing on rating alone: line contact gives 715 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1052?",
        "a": "N1052 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1052 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1052 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1052",
      "N1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1052",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1052 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 260×400×65 mm ISO 15 envelope. Numbering ties NJ1052 to its envelope: type code NJ, series NJ1000, 260 mm bore; the 400×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 715 kN and C0 1000 kN (C0/C ≈ 1.40) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Thermal planning around the 1,600 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,900 r/min for continuously high-duty 260 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g NJ1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ1052 with a deep-groove ball bearing on rating alone: line contact gives 715 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NJ1052 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1052 skids at 1,600 r/min and fails by smearing long before L10 fatigue.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1052?",
        "a": "NJ1052 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1052 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1052 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1052-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1052",
      "NJ1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3052",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 47400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3052 is the standard section of the NTN NN3000 dimension series for a 260 mm shaft — 1180 kN of basic dynamic capacity in a 47400 g, open bearing. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. The 4.5 kN-per-mm-bore figure (1180 kN over 260 mm) lets a NN3052 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 47400 g NN3052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 104 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 104 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 260 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 400×104 mm envelope matches.",
      "The 104 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1180/1990 kN ratings, 170 kN Pu and 47400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3052?",
        "a": "NN3052 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1990 kN, Pu 170 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 47400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3052 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3052?",
        "a": "NN3052 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3052?",
        "a": "NTN rates NN3052 at 1,500 r/min with grease and 1,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3052",
      "NN3052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3052K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3052K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1700,
    "weight_g": 45800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies NN3052K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,500 r/min on grease and 1,700 r/min on oil. Digit by digit, NN3052K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 70.0 mm radial section ((400−260)/2) frames the roller complement; capacity per millimetre of bore is about 4.5 kN/mm before application factors. Mass 45800 g for the 260×400×104 mm NN3052K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3052K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 45800 g NN3052K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 104 mm-wide cavity.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 260 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 400×104 mm envelope matches.",
      "The 104 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 70.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 104 mm-wide cavity.",
      "The 1180/1990 kN ratings, 170 kN Pu and 45800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3052K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3052K?",
        "a": "NN3052K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1990 kN, Pu 170 kN, grease limiting speed 1,500 r/min, oil 1,700 r/min, mass about 45800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3052K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3052K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3052K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3052K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3052 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3052K?",
        "a": "NTN rates NN3052K at 1,500 r/min with grease and 1,700 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3052K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3052k",
      "NN3052K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1052",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1052 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 260 mm shaft — 715 kN of basic dynamic capacity in a 28700 g, open bearing. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1052. Mass 28700 g for the 260×400×65 mm NU1052 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g NU1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 260 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 400×65 mm envelope matches.",
      "Open NU1052 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 400 mm race brinells and releases as vibration within hours.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1052?",
        "a": "NU1052 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1052 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1052 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1052-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×400×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1052",
      "NU1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1052",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1052",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 715,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 85,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1052 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 260 mm shaft — 715 kN of basic dynamic capacity in a 28700 g, open bearing. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1052 designation when purchasing. Rating life at 715 kN C assumes clean oil and adequate film; the 85 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1052.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,900 r/min need positive flow and drain design; the 28700 g NUP1052 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 400×65 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP1052 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 715/1000 kN pair here belongs to NUP1052 as printed, not to the bare size.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 715/1000 kN ratings, 85 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1052 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1052?",
        "a": "NUP1052 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 65 mm width (10.236 × 15.748 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 715 kN, C0 1000 kN, Pu 85 kN, grease limiting speed 1,600 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1052 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1052 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1052 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1052?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 296 mm, Ew 364 mm. The nominal bore/OD remain 260/400 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,600 r/min grease / 1,900 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1052",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1052",
      "NUP1052"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2252",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies N2252: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,200 r/min on grease and 1,400 r/min on oil. Digit by digit, N2252 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for N2252; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g N2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N2252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for N2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1980/2930 kN pair here belongs to N2252 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1980/2930 kN pair here belongs to N2252 as printed, not to the bare size.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2252?",
        "a": "N2252 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2252 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2252 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2252",
      "N2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N252",
    "brand": "NTN",
    "manufacturer_designation": "NTN N252",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N252 is the standard section of the NTN N200 dimension series for a 260 mm shaft — 1270 kN of basic dynamic capacity in a 65600 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 480 mm OD and 80 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,300 r/min grease and 1,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g N252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open N252 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full N200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use N252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N252?",
        "a": "N252 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N252 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N252 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n252",
      "N252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF252",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF252 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1270 kN dynamic rating in the 260 mm bore. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF252. Equivalent-load planning treats NF252 as a pure radial bearing: keep P below 1270 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 260 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NF252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NF252 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF252 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NF252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF252?",
        "a": "NF252 is an NTN NF single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF252 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF252 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf252",
      "NF252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2252",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ2252 on the 260×480 mm envelope, 130 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,200 r/min. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. Selection arithmetic: Pu 241 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.48 (2930/1980 kN) shows the high-static-capacity proportioning of this 260 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ2252 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g NJ2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 480×130 mm envelope matches.",
      "The 110.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 130 mm-wide cavity.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "If the shaft must be located both ways, do not use NJ2252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2252?",
        "a": "NJ2252 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2252 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2252 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2252-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×480×130 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2252",
      "NJ2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ252",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ252 denotes a 260×480×80 mm (10.236 × 18.898 × 3.15 in) cylindrical roller bearing in the NJ200 family, a pressed sheet-steel cage. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 260 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,300 r/min grease and 1,600 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ252 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NJ252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ252 with a deep-groove ball bearing on rating alone: line contact gives 1270 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NJ252 as printed, not to the bare size.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 480×80 mm envelope matches.",
      "If the shaft must be located both ways, do not use NJ252 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ252?",
        "a": "NJ252 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ252 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ252 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj252",
      "NJ252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2252",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU2252 denotes a 260×480×130 mm (10.236 × 18.898 × 5.118 in) cylindrical roller bearing in the NU2200 family, a pressed sheet-steel cage. Numbering ties NU2252 to its envelope: type code NU, series NU2200, 260 mm bore; the 480×130 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 110.0 mm radial section ((480−260)/2) frames the roller complement; capacity per millimetre of bore is about 7.6 kN/mm before application factors. Thermal planning around the 1,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,400 r/min for continuously high-duty 260 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 260 mm shaft.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g NU2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NU2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NU2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NU2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 110.0 mm section at 260 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 130 mm-wide cavity.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2252?",
        "a": "NU2252 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2252 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2252 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2252-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×480×130 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2252",
      "NU2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU252",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies NU252: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,300 r/min on grease and 1,600 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU252 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU252 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 4.9 kN-per-mm-bore figure (1270 kN over 260 mm) lets a NU252 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU252 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NU252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU252 with a deep-groove ball bearing on rating alone: line contact gives 1270 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NU252 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU252?",
        "a": "NU252 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU252 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU252 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu252",
      "NU252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2252",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1980,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 241,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2252 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 260×480×130 mm ISO 15 envelope. Numbering ties NUP2252 to its envelope: type code NUP, series NUP2200, 260 mm bore; the 480×130 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2252 designation when purchasing. Equivalent-load planning treats NUP2252 as a pure radial bearing: keep P below 1980 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 260 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 102000 g NUP2252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NUP2252: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1980/2930 kN ratings, 241 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2252?",
        "a": "NUP2252 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1980 kN, C0 2930 kN, Pu 241 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 102000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2252 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2252 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2252",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2252",
      "NUP2252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP252",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP252",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 137,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 65600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP252 appears as a 260 mm bore single-row cylindrical roller bearing (1270 kN C / 1660 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NUP252 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP252 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats NUP252 as a pure radial bearing: keep P below 1270 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 65600 g NUP252 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP252 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "Open NUP252 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1270/1660 kN pair here belongs to NUP252 as printed, not to the bare size.",
      "Do not replace NUP252 with a deep-groove ball bearing on rating alone: line contact gives 1270 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1270/1660 kN ratings, 137 kN Pu and 65600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP252 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP252?",
        "a": "NUP252 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 80 mm width (10.236 × 18.898 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1660 kN, Pu 137 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 65600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP252 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP252 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP252 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP252?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 320 mm, Ew 420 mm. The nominal bore/OD remain 260/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP252-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup252",
      "NUP252"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2352",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2352 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 2600 kN dynamic rating in the 260 mm bore. Numbering ties N2352 to its envelope: type code N, series N2300, 260 mm bore; the 540×165 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded N2352 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 260 mm (10.236 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 165 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 260 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g N2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use N2352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "Do not replace N2352 with a deep-groove ball bearing on rating alone: line contact gives 2600 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2352?",
        "a": "N2352 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2352 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2352 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2352",
      "N2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N352",
    "brand": "NTN",
    "manufacturer_designation": "NTN N352",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N352 denotes a 260×540×102 mm (10.236 × 21.26 × 4.016 in) cylindrical roller bearing in the N300 family, a pressed sheet-steel cage. On the NTN nameplate N states which ring carries the ribs, which determines whether N352 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of N352. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for N352; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N352 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g N352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace N352 with a deep-groove ball bearing on rating alone: line contact gives 1790 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use N352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N352?",
        "a": "N352 is an NTN N single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N352 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N352 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n352",
      "N352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF352",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NF352 appears as a 260 mm bore single-row cylindrical roller bearing (1790 kN C / 2230 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NF352 reads as NF (one rib on each ring), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1790 kN and C0 2230 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NF design gives one-direction axial guidance via its single outer-ring rib. The 260 mm (10.236 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 102 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF352.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NF352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NF300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NF352 with a deep-groove ball bearing on rating alone: line contact gives 1790 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The NF rib arrangement is not interchangeable with another prefix on the same 260 mm seat: one rib on each ring. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF352?",
        "a": "NF352 is an NTN NF single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF352 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF352 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf352",
      "NF352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2352",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 260 mm shaft NTN supplies NJ2352: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,000 r/min on grease and 1,200 r/min on oil. Digit by digit, NJ2352 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ2352. Mass 178000 g for the 260×540×165 mm NJ2352 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g NJ2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,000 r/min and oil 1,200 r/min are different limits for NJ2352: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2352 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2352?",
        "a": "NJ2352 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2352 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2352 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2352-ECMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×540×165 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2352",
      "NJ2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ352",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ352 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 260×540×102 mm ISO 15 envelope. Numbering ties NJ352 to its envelope: type code NJ, series NJ300, 260 mm bore; the 540×102 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 1790 kN and C0 2230 kN (C0/C ≈ 1.25) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Rating life at 1790 kN C assumes clean oil and adequate film; the 180 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ352 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NJ352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Do not replace NJ352 with a deep-groove ball bearing on rating alone: line contact gives 1790 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ352?",
        "a": "NJ352 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ352 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ352 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj352",
      "NJ352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2352",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2352 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 260×540×165 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2352 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN prints two speed ceilings: 1,000 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 260 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 260 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g NU2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU2352 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "If the shaft must be located both ways, do not use NU2352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2352 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NU2352 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2352?",
        "a": "NU2352 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2352 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2352 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2352-ECMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×540×165 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2352",
      "NU2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU352",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU352 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1790 kN dynamic rating in the 260 mm bore. Digit by digit, NU352 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 260 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NU352 designation when purchasing. The 260 mm (10.236 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 102 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU352 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NU352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 260 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 102 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 260 mm inner ring.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU352?",
        "a": "NU352 is an NTN NU single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU352 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU352 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU352-ECMA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 260×540×102 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu352",
      "NU352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2352",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3600,
    "fatigue_load_limit_kN": 289,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP2352 on the 260×540 mm envelope, 165 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,000 r/min. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2352 floats or locates; the numeric remainder is the ISO 15 series and 260 mm bore reference, not a fit or clearance instruction. NTN prints the raceway diameters for this size — Fw 336 mm and Ew 464 mm — the envelope inside the 260/540 mm bore/OD where the rollers actually run. Thermal planning around the 1,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 260 mm positions. Heat the inner ring to max 120 °C for the 260 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 178000 g NUP2352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP2352 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 260 mm contact.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NUP2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 1,000 r/min and oil 1,200 r/min are different limits for NUP2352: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×165 mm envelope matches.",
      "The 2600/3600 kN ratings, 289 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2352?",
        "a": "NUP2352 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3600 kN, Pu 289 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 178000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2352 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2352 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2352",
      "NUP2352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP352",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP352",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2230,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 114000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP352 is the standard section of the NTN NUP300 dimension series for a 260 mm shaft — 1790 kN of basic dynamic capacity in a 114000 g, open bearing. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 260 mm, with 540 mm OD and 102 mm width from the ISO 15 general plan. NTN prints the raceway diameters for this size — Fw 336 mm and Ew 464 mm — the envelope inside the 260/540 mm bore/OD where the rollers actually run. Selection arithmetic: Pu 180 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.25 (2230/1790 kN) shows the high-static-capacity proportioning of this 260 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 260 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 114000 g NUP352 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 260 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP352 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 260 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×102 mm envelope matches.",
      "The 1790/2230 kN ratings, 180 kN Pu and 114000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP352 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP352?",
        "a": "NUP352 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 102 mm width (10.236 × 21.26 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2230 kN, Pu 180 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 114000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP352 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP352 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP352 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP352?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 336 mm, Ew 464 mm. The nominal bore/OD remain 260/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP352",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup352",
      "NUP352"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4956",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4956",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1030,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 187,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 30200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NN4956: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,400 r/min on grease and 1,700 r/min on oil. Digit by digit, NN4956 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NN4956 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,400 r/min is .82 of the 1,700 r/min oil value for NN4956; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 280 mm shaft.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 30200 g NN4956 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1030/2200 kN pair here belongs to NN4956 as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 380 mm race brinells and releases as vibration within hours.",
      "Open NN4956 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Do not replace NN4956 with a deep-groove ball bearing on rating alone: line contact gives 1030 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1030/2200 kN ratings, 187 kN Pu and 30200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4956 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4956?",
        "a": "NN4956 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 100 mm width (11.024 × 14.961 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1030 kN, C0 2200 kN, Pu 187 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 30200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4956 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4956 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4956?",
        "a": "NN4956 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4956?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 312 mm. The nominal bore/OD remain 280/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4956",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4956",
      "NN4956"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4956K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4956K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1030,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 187,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 28800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NN4956K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,400 r/min on grease and 1,700 r/min on oil. Numbering ties NN4956K to its envelope: type code NN, series NN4900, 280 mm bore; the 380×100 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Thermal planning around the 1,400 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,700 r/min for continuously high-duty 280 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 280 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 28800 g NN4956K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4956K with a deep-groove ball bearing on rating alone: line contact gives 1030 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,400 r/min and oil 1,700 r/min are different limits for NN4956K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 50.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The 1030/2200 kN ratings, 187 kN Pu and 28800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4956K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4956K?",
        "a": "NN4956K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 100 mm width (11.024 × 14.961 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1030 kN, C0 2200 kN, Pu 187 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 28800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4956K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4956K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4956K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4956K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4956 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4956K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 312 mm. The nominal bore/OD remain 280/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4956K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4956k",
      "NN4956K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4956K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4956K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1030,
    "static_load_kN": 2200,
    "fatigue_load_limit_kN": 187,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 30200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NNU4956K denotes a 280×380×100 mm (11.024 × 14.961 × 3.937 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 380 mm OD and 100 mm width from the ISO 15 general plan. The 50.0 mm radial section ((380−280)/2) frames the roller complement; capacity per millimetre of bore is about 3.7 kN/mm before application factors. Rating life at 1030 kN C assumes clean oil and adequate film; the 187 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NNU4956K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,700 r/min need positive flow and drain design; the 30200 g NNU4956K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NNU4956K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 50.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4956K skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 50.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 1030/2200 kN ratings, 187 kN Pu and 30200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4956K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4956K?",
        "a": "NNU4956K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 100 mm width (11.024 × 14.961 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1030 kN, C0 2200 kN, Pu 187 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 30200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4956K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4956K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4956K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4956K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4956 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4956K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 312 mm. The nominal bore/OD remain 280/380 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,700 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4956K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4956k",
      "NNU4956K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1056",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1056 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 730 kN dynamic rating in the 280 mm bore. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1056 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Equivalent-load planning treats N1056 as a pure radial bearing: keep P below 730 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1056.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g N1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,500 r/min and oil 1,800 r/min are different limits for N1056: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace N1056 with a deep-groove ball bearing on rating alone: line contact gives 730 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1056?",
        "a": "N1056 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1056 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1056 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1056",
      "N1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1056",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NJ1056: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,500 r/min on grease and 1,800 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1056 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1056. Selection arithmetic: Pu 88 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.44 (1050/730 kN) shows the high-static-capacity proportioning of this 280 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1056 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g NJ1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ1056 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 730/1050 kN pair here belongs to NJ1056 as printed, not to the bare size.",
      "The 70.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1056?",
        "a": "NJ1056 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1056 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1056 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1056",
      "NJ1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3056",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1200,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 174,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 51100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3056 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 280×420×106 mm ISO 15 envelope. Numbering ties NN3056 to its envelope: type code NN, series NN3000, 280 mm bore; the 420×106 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3056 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN3056; an oversized radius locks the ring on its face and tilts the 106 mm-wide seat.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 51100 g NN3056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "Open NN3056 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Do not replace NN3056 with a deep-groove ball bearing on rating alone: line contact gives 1200 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1200/2080 kN ratings, 174 kN Pu and 51100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3056?",
        "a": "NN3056 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1200 kN, C0 2080 kN, Pu 174 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 51100 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3056 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3056?",
        "a": "NN3056 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3056?",
        "a": "NTN rates NN3056 at 1,300 r/min with grease and 1,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3056",
      "NN3056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3056K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3056K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1200,
    "static_load_kN": 2080,
    "fatigue_load_limit_kN": 174,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 49300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3056K on the 280×420 mm envelope, 106 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,300 r/min. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). The roller-set pitch sits inside the 70.0 mm radial section between the 280 mm bore and 420 mm OD; NTN prints Fw/Ew raceway diameters only for selected executions. Equivalent-load planning treats NN3056K as a pure radial bearing: keep P below 1200 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 49300 g NN3056K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The K tapered bore of NN3056K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 420 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1200/2080 kN pair here belongs to NN3056K as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 280 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 420×106 mm envelope matches.",
      "The 1200/2080 kN ratings, 174 kN Pu and 49300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3056K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3056K?",
        "a": "NN3056K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1200 kN, C0 2080 kN, Pu 174 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 49300 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3056K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3056K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3056K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3056K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3056 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3056K?",
        "a": "NTN rates NN3056K at 1,300 r/min with grease and 1,600 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3056K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=159",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3056k",
      "NN3056K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1056",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1056 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 280×420×65 mm ISO 15 envelope. Numbering ties NU1056 to its envelope: type code NU, series NU1000, 280 mm bore; the 420×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,500 r/min grease and 1,800 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. The 2.6 kN-per-mm-bore figure (730 kN over 280 mm) lets a NU1056 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NU1056; an oversized radius locks the ring on its face and tilts the 65 mm-wide seat.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g NU1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The 70.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 65 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NU1056 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1056?",
        "a": "NU1056 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1056 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1056 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1056-ML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×420×65 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1056",
      "NU1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1056",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1056",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 65,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 730,
    "static_load_kN": 1050,
    "fatigue_load_limit_kN": 88,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 30400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1056 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 280×420×65 mm ISO 15 envelope. Numbering ties NUP1056 to its envelope: type code NUP, series NUP1000, 280 mm bore; the 420×65 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1056 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 1,500 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,800 r/min for continuously high-duty 280 mm positions. Keep the open bearing wrapped until fitting: the line-contact raceways of the 280 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,800 r/min need positive flow and drain design; the 30400 g NUP1056 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1056 skids at 1,500 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 730/1050 kN pair here belongs to NUP1056 as printed, not to the bare size.",
      "The 65 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Do not replace NUP1056 with a deep-groove ball bearing on rating alone: line contact gives 730 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 730/1050 kN ratings, 88 kN Pu and 30400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1056 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1056?",
        "a": "NUP1056 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 65 mm width (11.024 × 16.535 × 2.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 730 kN, C0 1050 kN, Pu 88 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 30400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1056 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1056 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1056 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1056?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 316 mm, Ew 384 mm. The nominal bore/OD remain 280/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,500 r/min grease / 1,800 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1056",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1056",
      "NUP1056"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2256",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N2256 appears as a 280 mm bore single-row cylindrical roller bearing (2050 kN C / 3100 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 500 mm OD and 130 mm width from the ISO 15 general plan. With C 2050 kN and C0 3100 kN (C0/C ≈ 1.51) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Equivalent-load planning treats N2256 as a pure radial bearing: keep P below 2050 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2256 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g N2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "If the shaft must be located both ways, do not use N2256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 130 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2256 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2256?",
        "a": "N2256 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2256 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2256 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2256",
      "N2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N256",
    "brand": "NTN",
    "manufacturer_designation": "NTN N256",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N256 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 280×500×80 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). The 80 mm width and 110.0 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for N256; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N256 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g N256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N256 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The N rib arrangement is not interchangeable with another prefix on the same 280 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 500×80 mm envelope matches.",
      "Open N256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N256?",
        "a": "N256 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N256 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N256 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n256",
      "N256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF256",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF256 is the standard section of the NTN NF200 dimension series for a 280 mm shaft — 1320 kN of basic dynamic capacity in a 69400 g, open bearing. Numbering ties NF256 to its envelope: type code NF, series NF200, 280 mm bore; the 500×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. The 280 mm (11.024 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF256.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NF256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 80 mm-wide cavity.",
      "Do not replace NF256 with a deep-groove ball bearing on rating alone: line contact gives 1320 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1320/1760 kN pair here belongs to NF256 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NF256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF256?",
        "a": "NF256 is an NTN NF single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF256 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF256 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf256",
      "NF256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2256",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2256 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 2050 kN dynamic rating in the 280 mm bore. Numbering ties NJ2256 to its envelope: type code NJ, series NJ2200, 280 mm bore; the 500×130 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 130 mm width and 110.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 107000 g for the 280×500×130 mm NJ2256 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g NJ2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ2256 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 500 mm race brinells and releases as vibration within hours.",
      "The 110.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 130 mm-wide cavity.",
      "Open NJ2256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2256?",
        "a": "NJ2256 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2256 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2256 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2256",
      "NJ2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ256",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ256 on the 280×500 mm envelope, 80 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,200 r/min. Numbering ties NJ256 to its envelope: type code NJ, series NJ200, 280 mm bore; the 500×80 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 80 mm width and 110.0 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 1,200 r/min is .86 of the 1,400 r/min oil value for NJ256; grease-churn heating closes that gap as fill quantity rises. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NJ256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NJ256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Open NJ256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Open NJ256 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ256?",
        "a": "NJ256 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ256 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ256 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ256-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×500×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj256",
      "NJ256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2256",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU2256 on the 280×500 mm envelope, 130 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2256 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. At 1,300 r/min with oil versus 1,100 r/min with grease (a 200 r/min band), lubrication choice for NU2256 is a thermal decision, not just a sealing one. Selection arithmetic: Pu 252 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.51 (3100/2050 kN) shows the high-static-capacity proportioning of this 280 mm bore. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g NU2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2050/3100 kN pair here belongs to NU2256 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NU2256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 280 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 500×130 mm envelope matches.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NU2256: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2256?",
        "a": "NU2256 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2256 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2256 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2256-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×500×130 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2256",
      "NU2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU256",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU256 appears as a 280 mm bore single-row cylindrical roller bearing (1320 kN C / 1760 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NU256 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NU256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU256 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 280 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 500×80 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1320/1760 kN pair here belongs to NU256 as printed, not to the bare size.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU256?",
        "a": "NU256 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU256 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU256 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU256-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×500×80 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu256",
      "NU256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2256",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2050,
    "static_load_kN": 3100,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NUP2256: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,100 r/min on grease and 1,300 r/min on oil. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2256 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2256 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 280 mm (11.024 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 130 mm-wide ring. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 107000 g NUP2256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2050/3100 kN pair here belongs to NUP2256 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NUP2256 with a deep-groove ball bearing on rating alone: line contact gives 2050 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2050/3100 kN ratings, 252 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2256?",
        "a": "NUP2256 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2050 kN, C0 3100 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 107000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2256 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2256 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2256",
      "NUP2256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP256",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP256",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1320,
    "static_load_kN": 1760,
    "fatigue_load_limit_kN": 143,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 69400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP256 denotes a 280×500×80 mm (11.024 × 19.685 × 3.15 in) cylindrical roller bearing in the NUP200 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 500 mm OD and 80 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP256 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 280 mm (11.024 in) bore and 500 mm (19.685 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 80 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NUP256; an oversized radius locks the ring on its face and tilts the 80 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 69400 g NUP256 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NUP256: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP256 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 80 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1320/1760 kN ratings, 143 kN Pu and 69400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP256 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP256?",
        "a": "NUP256 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 80 mm width (11.024 × 19.685 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1320 kN, C0 1760 kN, Pu 143 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 69400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP256 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP256 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP256 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP256?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 440 mm. The nominal bore/OD remain 280/500 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP256",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup256",
      "NUP256"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2356",
    "series": "N2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N2356 is the extra-wide (23) section of the NTN N2300 dimension series for a 280 mm shaft — 3000 kN of basic dynamic capacity in a 218000 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N2356 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives N2356 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 3000 kN C assumes clean oil and adequate film; the 335 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2356 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g N2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 280 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 580×175 mm envelope matches.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 3000/4250 kN pair here belongs to N2356 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full N2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2356?",
        "a": "N2356 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2356 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2356 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2356",
      "N2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N356",
    "brand": "NTN",
    "manufacturer_designation": "NTN N356",
    "series": "N300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N356 on the 280×580 mm envelope, 108 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Digit by digit, N356 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,100 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. Equivalent-load planning treats N356 as a pure radial bearing: keep P below 2010 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g N356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace N356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2010/2540 kN pair here belongs to N356 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use N356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N356?",
        "a": "N356 is an NTN N single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N356 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N356 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n356",
      "N356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF356",
    "series": "NF300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NF356 denotes a 280×580×108 mm (11.024 × 22.835 × 4.252 in) cylindrical roller bearing in the NF300 family, a pressed sheet-steel cage. The leading NF defines the rib arrangement (one rib on each ring); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 580 mm OD and 108 mm width from the ISO 15 general plan. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF356. Rating life at 2010 kN C assumes clean oil and adequate film; the 200 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Keep the open bearing wrapped until fitting: the line-contact raceways of the 280 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NF356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NF356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Grease limiting speed 1,100 r/min and oil 1,200 r/min are different limits for NF356: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NF356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF356?",
        "a": "NF356 is an NTN NF single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF356 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF356 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf356",
      "NF356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2356",
    "series": "NJ2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ2356 appears as a 280 mm bore single-row cylindrical roller bearing (3000 kN C / 4250 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 580 mm OD and 175 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 920 r/min grease and 1,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 280 mm bore. The 10.7 kN-per-mm-bore figure (3000 kN over 280 mm) lets a NJ2356 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Housing and shaft fillets must clear the ring chamfers of NJ2356; an oversized radius locks the ring on its face and tilts the 175 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g NJ2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 3000/4250 kN pair here belongs to NJ2356 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NJ2300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NJ2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NJ2356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2356?",
        "a": "NJ2356 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2356 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2356 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2356",
      "NJ2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ356",
    "series": "NJ300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NJ356: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 1,100 r/min on grease and 1,200 r/min on oil. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ356 floats or locates; the numeric remainder is the ISO 15 series and 280 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ356. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 280 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NJ356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ356 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 150.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "Grease limiting speed 1,100 r/min and oil 1,200 r/min are different limits for NJ356: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ356?",
        "a": "NJ356 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ356 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ356 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj356",
      "NJ356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2356",
    "series": "NU2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 280 mm shaft NTN supplies NU2356: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 920 r/min on grease and 1,100 r/min on oil. Digit by digit, NU2356 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 175 mm width and 150.0 mm section put the NU2300 series in the extra-wide (23) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 920 r/min is .84 of the 1,100 r/min oil value for NU2356; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 280 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g NU2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 3000/4250 kN pair here belongs to NU2356 as printed, not to the bare size.",
      "Do not replace NU2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2356?",
        "a": "NU2356 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2356 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2356 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2356-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 280×580×175 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2356",
      "NU2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU356",
    "series": "NU300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU356 is the standard section of the NTN NU300 dimension series for a 280 mm shaft — 2010 kN of basic dynamic capacity in a 139000 g, open bearing. The leading NU defines the rib arrangement (outer ring ribbed, inner ring ribless); the dimension-series digits and the two-digit bore code resolve to 280 mm, with 580 mm OD and 108 mm width from the ISO 15 general plan. Minimum radial load matters: an unloaded NU356 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Rating life at 2010 kN C assumes clean oil and adequate film; the 200 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NU356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU356 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "The 150.0 mm section at 280 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 108 mm-wide cavity.",
      "Do not replace NU356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NU356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU356?",
        "a": "NU356 is an NTN NU single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU356 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU356 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu356",
      "NU356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2356",
    "series": "NUP2300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3000,
    "static_load_kN": 4250,
    "fatigue_load_limit_kN": 335,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1100,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP2356 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 3000 kN dynamic rating in the 280 mm bore. Digit by digit, NUP2356 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 280 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2356 designation when purchasing. Selection arithmetic: Pu 335 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.42 (4250/3000 kN) shows the high-static-capacity proportioning of this 280 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2356.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 218000 g NUP2356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP2356 with a deep-groove ball bearing on rating alone: line contact gives 3000 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 280 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 580×175 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP2356 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 175 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The 3000/4250 kN ratings, 335 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2356?",
        "a": "NUP2356 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3000 kN, C0 4250 kN, Pu 335 kN, grease limiting speed 920 r/min, oil 1,100 r/min, mass about 218000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2356 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2356 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 920 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2356",
      "NUP2356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP356",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP356",
    "series": "NUP300-series",
    "type": "cylindrical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2010,
    "static_load_kN": 2540,
    "fatigue_load_limit_kN": 200,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP356 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 280×580×108 mm ISO 15 envelope. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 280 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP356 designation when purchasing. Mass 139000 g for the 280×580×108 mm NUP356 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP356; an oversized radius locks the ring on its face and tilts the 108 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 280 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 139000 g NUP356 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP356 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 280 mm contact.",
      "Do not replace NUP356 with a deep-groove ball bearing on rating alone: line contact gives 2010 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 280 mm bore share bore but not OD/width; check the full NUP300 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 108 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 280 mm inner ring.",
      "The 2010/2540 kN ratings, 200 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP356 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP356?",
        "a": "NUP356 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 108 mm width (11.024 × 22.835 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2010 kN, C0 2540 kN, Pu 200 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 139000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP356 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP356 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP356 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP356?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 362 mm, Ew 498 mm. The nominal bore/OD remain 280/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP356",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup356",
      "NUP356"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4960",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4960",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1330,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 231,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 46400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN4960 appears as a 300 mm bore single-row cylindrical roller bearing (1330 kN C / 2800 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN4960 floats or locates; the numeric remainder is the ISO 15 series and 300 mm bore reference, not a fit or clearance instruction. Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Thermal planning around the 1,300 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,500 r/min for continuously high-duty 300 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 300 mm shaft.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 46400 g NN4960 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN4960 does not substitute a precision-class execution.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN4960 skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 1330/2800 kN ratings, 231 kN Pu and 46400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4960 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4960?",
        "a": "NN4960 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 118 mm width (11.811 × 16.535 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 2800 kN, Pu 231 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 46400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4960 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4960 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4960?",
        "a": "NN4960 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4960?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 339 mm. The nominal bore/OD remain 300/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4960",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4960",
      "NN4960"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4960K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4960K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1330,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 231,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 44200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN4960K on the 300×420 mm envelope, 118 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,300 r/min. Numbering ties NN4960K to its envelope: type code NN, series NN4900, 300 mm bore; the 420×118 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 118 mm width and 60.0 mm section put the NN4900 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN4960K.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 44200 g NN4960K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1330/2800 kN pair here belongs to NN4960K as printed, not to the bare size.",
      "The 60.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 300 mm bore share bore but not OD/width; check the full NN4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NN4960K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 1330/2800 kN ratings, 231 kN Pu and 44200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4960K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4960K?",
        "a": "NN4960K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 118 mm width (11.811 × 16.535 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 2800 kN, Pu 231 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 44200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4960K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4960K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4960K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4960K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4960 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4960K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 339 mm. The nominal bore/OD remain 300/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4960K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4960k",
      "NN4960K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4960K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4960K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1330,
    "static_load_kN": 2800,
    "fatigue_load_limit_kN": 231,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 46400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NNU4960K denotes a 300×420×118 mm (11.811 × 16.535 × 4.646 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NNU states which ring carries the ribs, which determines whether NNU4960K floats or locates; the numeric remainder is the ISO 15 series and 300 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NNU4960K at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,300 r/min is .87 of the 1,500 r/min oil value for NNU4960K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NNU4960K; an oversized radius locks the ring on its face and tilts the 118 mm-wide seat.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 46400 g NNU4960K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NNU4960K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4960K skids at 1,300 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 1,300 r/min and oil 1,500 r/min are different limits for NNU4960K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NNU4960K with a deep-groove ball bearing on rating alone: line contact gives 1330 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1330/2800 kN ratings, 231 kN Pu and 46400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4960K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4960K?",
        "a": "NNU4960K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 118 mm width (11.811 × 16.535 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 2800 kN, Pu 231 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 46400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4960K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4960K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4960K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4960K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4960 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4960K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 339 mm. The nominal bore/OD remain 300/420 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4960K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4960k",
      "NNU4960K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1060",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1060 is the extra-light (10/49) section of the NTN N1000 dimension series for a 300 mm shaft — 950 kN of basic dynamic capacity in a 42900 g, open bearing. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 300 mm, with 460 mm OD and 74 mm width from the ISO 15 general plan. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full N1060 designation when purchasing. Selection arithmetic: Pu 109 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.41 (1340/950 kN) shows the high-static-capacity proportioning of this 300 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of N1060.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g N1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The N rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×74 mm envelope matches.",
      "If the shaft must be located both ways, do not use N1060 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1060?",
        "a": "N1060 is an NTN N single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1060 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1060 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1060",
      "N1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1060",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1060 appears as a 300 mm bore single-row cylindrical roller bearing (950 kN C / 1340 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NJ1060 to its envelope: type code NJ, series NJ1000, 300 mm bore; the 460×74 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. With C 950 kN and C0 1340 kN (C0/C ≈ 1.41) the bearing is proportioned for heavy radial load; the NJ design accepts axial load in one direction and provides one-way shaft location. Speed ratio check: limiting 1,400 r/min is .88 of the 1,600 r/min oil value for NJ1060; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ1060 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g NJ1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NJ1060: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NJ1060: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1060 skids at 1,400 r/min and fails by smearing long before L10 fatigue.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1060?",
        "a": "NJ1060 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1060 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1060 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1060-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×460×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1060",
      "NJ1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3060",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1470,
    "static_load_kN": 2560,
    "fatigue_load_limit_kN": 209,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 70800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies NN3060: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,200 r/min on grease and 1,500 r/min on oil. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). Double-row NN precision cylindrical roller bearing: ribbed inner ring with a separable outer ring, two roller rows for high radial stiffness on machine-tool spindles; precision classes P5/P4/P2 and clearance are ordered separately. Rating life at 1470 kN C assumes clean oil and adequate film; the 209 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Housing and shaft fillets must clear the ring chamfers of NN3060; an oversized radius locks the ring on its face and tilts the 118 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 70800 g NN3060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 80.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3060 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 1470/2560 kN ratings, 209 kN Pu and 70800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3060?",
        "a": "NN3060 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1470 kN, C0 2560 kN, Pu 209 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 70800 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3060 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3060?",
        "a": "NN3060 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3060?",
        "a": "NTN rates NN3060 at 1,200 r/min with grease and 1,500 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3060",
      "NN3060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3060K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3060K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1470,
    "static_load_kN": 2560,
    "fatigue_load_limit_kN": 209,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 68600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3060K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 300×460×118 mm ISO 15 envelope. Digit by digit, NN3060K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 300 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3060K. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN3060K; an oversized radius locks the ring on its face and tilts the 118 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 68600 g NN3060K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3060K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3060K skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The K tapered bore of NN3060K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1470/2560 kN ratings, 209 kN Pu and 68600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3060K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3060K?",
        "a": "NN3060K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1470 kN, C0 2560 kN, Pu 209 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 68600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3060K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3060K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3060K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3060K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3060 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3060K?",
        "a": "NTN rates NN3060K at 1,200 r/min with grease and 1,500 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3060K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3060k",
      "NN3060K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1060",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies NU1060: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. Reading the code: NU for the non-locating separable-inner-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NU1060. The 300 mm (11.811 in) bore and 460 mm (18.11 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 74 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NU1060; an oversized radius locks the ring on its face and tilts the 74 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g NU1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NU1060 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 300 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 460×74 mm envelope matches.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1060?",
        "a": "NU1060 is an NTN NU single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1060 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1060 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1060-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×460×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1060",
      "NU1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1060",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1060",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 950,
    "static_load_kN": 1340,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1600,
    "weight_g": 42900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies NUP1060: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 1,400 r/min on grease and 1,600 r/min on oil. Reading the code: NUP for the two-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP1060 designation when purchasing. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NUP arrangements. Keep the open bearing wrapped until fitting: the line-contact raceways of the 300 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,600 r/min need positive flow and drain design; the 42900 g NUP1060 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP1060 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Grease limiting speed 1,400 r/min and oil 1,600 r/min are different limits for NUP1060: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 80.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 74 mm-wide cavity.",
      "The 74 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 950/1340 kN ratings, 109 kN Pu and 42900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1060 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1060?",
        "a": "NUP1060 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 74 mm width (11.811 × 18.11 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 950 kN, C0 1340 kN, Pu 109 kN, grease limiting speed 1,400 r/min, oil 1,600 r/min, mass about 42900 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1060 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1060 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1060 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1060?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 340 mm, Ew 420 mm. The nominal bore/OD remain 300/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,400 r/min grease / 1,600 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1060",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1060",
      "NUP1060"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2260",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N2260 denotes a 300×540×140 mm (11.811 × 21.26 × 5.512 in) cylindrical roller bearing in the N2200 family, a pressed sheet-steel cage. Digit by digit, N2260 reads as N (inner ring ribbed, outer ring ribless), ISO 15 series, and bore 300 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 290 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.51 (3650/2420 kN) shows the high-static-capacity proportioning of this 300 mm bore. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N2260 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g N2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2420/3650 kN pair here belongs to N2260 as printed, not to the bare size.",
      "Do not replace N2260 with a deep-groove ball bearing on rating alone: line contact gives 2420 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 140 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2420/3650 kN pair here belongs to N2260 as printed, not to the bare size.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2260?",
        "a": "N2260 is an NTN N single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2260 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2260 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2260",
      "N2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N260",
    "brand": "NTN",
    "manufacturer_designation": "NTN N260",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 300 mm shaft NTN supplies N260: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,100 r/min on grease and 1,300 r/min on oil. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 300 mm, with 540 mm OD and 85 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 300 mm bore. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,300 r/min for continuously high-duty 300 mm positions. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N260 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g N260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×85 mm envelope matches.",
      "The N rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×85 mm envelope matches.",
      "Open N260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "If the shaft must be located both ways, do not use N260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N260?",
        "a": "N260 is an NTN N single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N260 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N260 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n260",
      "N260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF260",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NF260 is an NTN NF cylindrical roller bearing: one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position, inside the 300×540×85 mm ISO 15 envelope. Reading the code: NF for the rib-on-each-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NF260. Mass 86400 g for the 300×540×85 mm NF260 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NF260.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NF260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 85 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Open NF260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 85 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF260?",
        "a": "NF260 is an NTN NF single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF260 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF260 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf260",
      "NF260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2260",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2260 is the wide (22) section of the NTN NJ2200 dimension series for a 300 mm shaft — 2420 kN of basic dynamic capacity in a 135000 g, open bearing. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,000 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 300 mm bore. Equivalent-load planning treats NJ2260 as a pure radial bearing: keep P below 2420 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g NJ2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ2260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 140 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ2260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2260?",
        "a": "NJ2260 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2260 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2260 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2260",
      "NJ2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ260",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ260 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1560 kN dynamic rating in the 300 mm bore. Reading the code: NJ for the one-direction-locating type, then the ISO 15 diameter/width series and the bore code — ×5 = 300 mm (00–03 use the 10/12/15/17 exception table). NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 300 mm bore. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,300 r/min for continuously high-duty 300 mm positions. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NJ260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NJ260: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ260 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NJ260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ260?",
        "a": "NJ260 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ260 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ260 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj260",
      "NJ260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2260",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2260 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 2420 kN dynamic rating in the 300 mm bore. Numbering ties NU2260 to its envelope: type code NU, series NU2200, 300 mm bore; the 540×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 120.0 mm radial section ((540−300)/2) frames the roller complement; capacity per millimetre of bore is about 8.1 kN/mm before application factors. Speed ratio check: limiting 1,000 r/min is .83 of the 1,200 r/min oil value for NU2260; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 300 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g NU2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU2260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NU2260 with a deep-groove ball bearing on rating alone: line contact gives 2420 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU2260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 140 mm-wide cavity.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2260?",
        "a": "NU2260 is an NTN NU single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2260 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2260 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2260-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 300×540×140 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2260",
      "NU2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU260",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU260 denotes a 300×540×85 mm (11.811 × 21.26 × 3.346 in) cylindrical roller bearing in the NU200 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU260 floats or locates; the numeric remainder is the ISO 15 series and 300 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NU260 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1560 kN C assumes clean oil and adequate film; the 164 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NU260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NU260: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NU260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NU260 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 300 mm contact.",
      "Wide (22/23) and light (10/49) executions at 300 mm bore share bore but not OD/width; check the full NU200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU260?",
        "a": "NU260 is an NTN NU single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU260 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU260 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU260-M",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu260",
      "NU260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2260",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2420,
    "static_load_kN": 3650,
    "fatigue_load_limit_kN": 290,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 135000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP2260 appears as a 300 mm bore single-row cylindrical roller bearing (2420 kN C / 3650 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP2260 to its envelope: type code NUP, series NUP2200, 300 mm bore; the 540×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. the bare number is the standard-capacity open execution with the normal pressed-steel cage; quote the full NUP2260 designation when purchasing. Mass 135000 g for the 300×540×140 mm NUP2260 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Heat the inner ring to max 120 °C for the 300 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 135000 g NUP2260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP2260 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 140 mm-wide cavity.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×140 mm envelope matches.",
      "The 140 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 300 mm inner ring.",
      "The 2420/3650 kN ratings, 290 kN Pu and 135000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2260?",
        "a": "NUP2260 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 3650 kN, Pu 290 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 135000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2260 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2260 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2260",
      "NUP2260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP260",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP260",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1560,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 86400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP260 on the 300×540 mm envelope, 85 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Digit by digit, NUP260 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 300 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NUP260 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 86400 g for the 300×540×85 mm NUP260 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP260; an oversized radius locks the ring on its face and tilts the 85 mm-wide seat.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 300 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 86400 g NUP260 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP260 with a deep-groove ball bearing on rating alone: line contact gives 1560 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 300 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×85 mm envelope matches.",
      "The 120.0 mm section at 300 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 85 mm-wide cavity.",
      "Do not replace NUP260 with a deep-groove ball bearing on rating alone: line contact gives 1560 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1560/2070 kN ratings, 164 kN Pu and 86400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP260 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP260?",
        "a": "NUP260 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 85 mm width (11.811 × 21.26 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1560 kN, C0 2070 kN, Pu 164 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 86400 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP260 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP260 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP260 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP260?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 364 mm, Ew 476 mm. The nominal bore/OD remain 300/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP260",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup260",
      "NUP260"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4964",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4964",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 2970,
    "fatigue_load_limit_kN": 242,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 49000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN4964 denotes a 320×440×118 mm (12.598 × 17.323 × 4.646 in) cylindrical roller bearing in the NN4900 family, a machined or stamped steel cage per the precision execution. Digit by digit, NN4964 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 320 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Minimum radial load matters: an unloaded NN4964 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 242 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 2.17 (2970/1370 kN) shows the high-static-capacity proportioning of this 320 mm bore. Heat the inner ring to max 120 °C for the 320 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 49000 g NN4964 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 320 mm inner ring.",
      "The 60.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 118 mm-wide cavity.",
      "Do not replace NN4964 with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NN4964 with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1370/2970 kN ratings, 242 kN Pu and 49000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4964 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4964?",
        "a": "NN4964 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 118 mm width (12.598 × 17.323 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1370 kN, C0 2970 kN, Pu 242 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 49000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4964 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4964 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4964?",
        "a": "NN4964 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN4900 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4964?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 359 mm. The nominal bore/OD remain 320/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4964",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4964",
      "NN4964"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN4964K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN4964K",
    "series": "NN4900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 2970,
    "fatigue_load_limit_kN": 242,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 46700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN4964K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 320×440×118 mm ISO 15 envelope. Digit by digit, NN4964K reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 320 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. At 1,400 r/min with oil versus 1,200 r/min with grease (a 200 r/min band), lubrication choice for NN4964K is a thermal decision, not just a sealing one. Rating life at 1370 kN C assumes clean oil and adequate film; the 242 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 320 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 46700 g NN4964K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN4964K with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1370/2970 kN pair here belongs to NN4964K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,200 r/min and oil 1,400 r/min are different limits for NN4964K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1370/2970 kN ratings, 242 kN Pu and 46700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN4964K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN4964K?",
        "a": "NN4964K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 118 mm width (12.598 × 17.323 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1370 kN, C0 2970 kN, Pu 242 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 46700 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN4964K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN4964K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN4964K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN4964K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN4964 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NN4964K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 359 mm. The nominal bore/OD remain 320/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN4964K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn4964k",
      "NN4964K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4964K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4964K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1370,
    "static_load_kN": 2970,
    "fatigue_load_limit_kN": 242,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 49100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4964K is the extra-light (10/49) section of the NTN NNU4900 dimension series for a 320 mm shaft — 1370 kN of basic dynamic capacity in a 49100 g, open bearing. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 320 mm, with 440 mm OD and 118 mm width from the ISO 15 general plan. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Thermal planning around the 1,200 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,400 r/min for continuously high-duty 320 mm positions. On NNU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 49100 g NNU4964K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 440 mm race brinells and releases as vibration within hours.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 320 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 440×118 mm envelope matches.",
      "Do not replace NNU4964K with a deep-groove ball bearing on rating alone: line contact gives 1370 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1370/2970 kN pair here belongs to NNU4964K as printed, not to the bare size.",
      "The 1370/2970 kN ratings, 242 kN Pu and 49100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4964K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4964K?",
        "a": "NNU4964K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 118 mm width (12.598 × 17.323 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1370 kN, C0 2970 kN, Pu 242 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 49100 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4964K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4964K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4964K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4964K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4964 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4964K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 359 mm. The nominal bore/OD remain 320/440 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4964K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4964k",
      "NNU4964K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1064",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1064 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 320×480×74 mm ISO 15 envelope. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 320 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1064 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Mass 45300 g for the 320×480×74 mm N1064 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 320 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g N1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The N rib arrangement is not interchangeable with another prefix on the same 320 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 480×74 mm envelope matches.",
      "Open N1064 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 970/1410 kN pair here belongs to N1064 as printed, not to the bare size.",
      "Do not replace N1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1064?",
        "a": "N1064 is an NTN N single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1064 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1064 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1064",
      "N1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1064",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ1064 denotes a 320×480×74 mm (12.598 × 18.898 × 2.913 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1064 floats or locates; the numeric remainder is the ISO 15 series and 320 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1064. Equivalent-load planning treats NJ1064 as a pure radial bearing: keep P below 970 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NJ arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g NJ1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 970/1410 kN pair here belongs to NJ1064 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ1064 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1064?",
        "a": "NJ1064 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1064 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1064 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1064-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×480×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1064",
      "NJ1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3064",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2670,
    "fatigue_load_limit_kN": 214,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 76200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3064 appears as a 320 mm bore single-row cylindrical roller bearing (1500 kN C / 2670 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NN3064 to its envelope: type code NN, series NN3000, 320 mm bore; the 480×121 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3064 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Thermal planning around the 1,100 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,300 r/min for continuously high-duty 320 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 320 mm shaft.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 76200 g NN3064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 80.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 121 mm-wide cavity.",
      "Do not replace NN3064 with a deep-groove ball bearing on rating alone: line contact gives 1500 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NN3064 with a deep-groove ball bearing on rating alone: line contact gives 1500 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1500/2670 kN ratings, 214 kN Pu and 76200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3064?",
        "a": "NN3064 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2670 kN, Pu 214 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 76200 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3064 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3064?",
        "a": "NN3064 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3064?",
        "a": "NTN rates NN3064 at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3064",
      "NN3064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3064K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3064K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2670,
    "fatigue_load_limit_kN": 214,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 73500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3064K denotes a 320×480×121 mm (12.598 × 18.898 × 4.764 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. Reading the code: NN for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 320 mm (00–03 use the 10/12/15/17 exception table). The 121 mm width and 80.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Rating life at 1500 kN C assumes clean oil and adequate film; the 214 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 73500 g NN3064K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 320 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 480×121 mm envelope matches.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NN3064K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN3064K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 1500/2670 kN ratings, 214 kN Pu and 73500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3064K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3064K?",
        "a": "NN3064K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2670 kN, Pu 214 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 73500 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3064K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3064K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3064K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3064K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3064 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3064K?",
        "a": "NTN rates NN3064K at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3064K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3064k",
      "NN3064K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1064",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1064 appears as a 320 mm bore single-row cylindrical roller bearing (970 kN C / 1410 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NU1064 to its envelope: type code NU, series NU1000, 320 mm bore; the 480×74 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,300 r/min grease and 1,500 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 320 mm bore. Rating life at 970 kN C assumes clean oil and adequate film; the 113 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 320 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g NU1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NU1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NU1064 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "If the shaft must be located both ways, do not use NU1064 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1064?",
        "a": "NU1064 is an NTN NU single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1064 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1064 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1064-MA",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×480×74 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1064",
      "NU1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1064",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1064",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 970,
    "static_load_kN": 1410,
    "fatigue_load_limit_kN": 113,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1500,
    "weight_g": 45300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1064 appears as a 320 mm bore single-row cylindrical roller bearing (970 kN C / 1410 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Numbering ties NUP1064 to its envelope: type code NUP, series NUP1000, 320 mm bore; the 480×74 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1064 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,300 r/min is .87 of the 1,500 r/min oil value for NUP1064; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NUP1064 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,500 r/min need positive flow and drain design; the 45300 g NUP1064 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NUP1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NUP1064 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 480 mm race brinells and releases as vibration within hours.",
      "Do not replace NUP1064 with a deep-groove ball bearing on rating alone: line contact gives 970 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 970/1410 kN ratings, 113 kN Pu and 45300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1064 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1064?",
        "a": "NUP1064 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 74 mm width (12.598 × 18.898 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 970 kN, C0 1410 kN, Pu 113 kN, grease limiting speed 1,300 r/min, oil 1,500 r/min, mass about 45300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1064 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1064 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1064 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1064?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 360 mm, Ew 440 mm. The nominal bore/OD remain 320/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,300 r/min grease / 1,500 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1064",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1064",
      "NUP1064"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN N2264",
    "series": "N2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N2264 on the 320×580 mm envelope, 150 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 950 r/min. The leading N defines the rib arrangement (inner ring ribbed, outer ring ribless); the dimension-series digits and the two-digit bore code resolve to 320 mm, with 580 mm OD and 150 mm width from the ISO 15 general plan. With C 2830 kN and C0 4350 kN (C0/C ≈ 1.54) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Mass 168000 g for the 320×580×150 mm N2264 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g N2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 130.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 150 mm-wide cavity.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for N2264: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N2264 skids at 950 r/min and fails by smearing long before L10 fatigue.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N2264?",
        "a": "N2264 is an NTN N single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N2264 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N2264 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N2264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n2264",
      "N2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N264",
    "brand": "NTN",
    "manufacturer_designation": "NTN N264",
    "series": "N200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N264 appears as a 320 mm bore single-row cylindrical roller bearing (1780 kN C / 2390 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 320 mm (00–03 use the 10/12/15/17 exception table). The 92 mm width and 130.0 mm section put the N200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 186 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.34 (2390/1780 kN) shows the high-static-capacity proportioning of this 320 mm bore. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g N264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "Open N264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "Open N264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N264?",
        "a": "N264 is an NTN N single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N264 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N264 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n264",
      "N264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NF264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NF264",
    "series": "NF200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 320 mm shaft NTN supplies NF264: one integral rib on each ring; the open execution is rated 1,000 r/min on grease and 1,200 r/min on oil. Numbering ties NF264 to its envelope: type code NF, series NF200, 320 mm bore; the 580×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,000 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 320 mm bore. The 5.6 kN-per-mm-bore figure (1780 kN over 320 mm) lets a NF264 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 320 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NF264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NF264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "The 130.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 92 mm-wide cavity.",
      "If the shaft must be located both ways, do not use NF264 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NF264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NF264?",
        "a": "NF264 is an NTN NF single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NF264 is one integral rib on each ring — separable inner ring with single-direction axial guidance and a defined shaft position."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NF264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NF264 take axial load and locate a shaft?",
        "a": "the NF design gives one-direction axial guidance via its single outer-ring rib. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NF264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NF264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nf264",
      "NF264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ2264",
    "series": "NJ2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ2264 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 320×580×150 mm ISO 15 envelope. Numbering ties NJ2264 to its envelope: type code NJ, series NJ2200, 320 mm bore; the 580×150 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 150 mm width and 130.0 mm section put the NJ2200 series in the wide (22) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. The 320 mm (12.598 in) bore and 580 mm (22.835 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 150 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NJ2264; an oversized radius locks the ring on its face and tilts the 150 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g NJ2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NJ2264 with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 130.0 mm section at 320 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 150 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NJ2200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Open NJ2264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ2264?",
        "a": "NJ2264 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ2264 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ2264 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ2264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj2264",
      "NJ2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ264",
    "series": "NJ200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ264 is the standard section of the NTN NJ200 dimension series for a 320 mm shaft — 1780 kN of basic dynamic capacity in a 109000 g, open bearing. Numbering ties NJ264 to its envelope: type code NJ, series NJ200, 320 mm bore; the 580×92 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. The 92 mm width and 130.0 mm section put the NJ200 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 186 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.34 (2390/1780 kN) shows the high-static-capacity proportioning of this 320 mm bore. Housing and shaft fillets must clear the ring chamfers of NJ264; an oversized radius locks the ring on its face and tilts the 92 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "false brinelling on standby machines exposed to external vibration",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NJ264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NJ264 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NJ264 as printed, not to the bare size.",
      "Do not replace NJ264 with a deep-groove ball bearing on rating alone: line contact gives 1780 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open NJ264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ264?",
        "a": "NJ264 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ264 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ264 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj264",
      "NJ264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU2264",
    "series": "NU2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU2264 is the wide (22) section of the NTN NU2200 dimension series for a 320 mm shaft — 2830 kN of basic dynamic capacity in a 168000 g, open bearing. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU2264 floats or locates; the numeric remainder is the ISO 15 series and 320 mm bore reference, not a fit or clearance instruction. At 1,100 r/min with oil versus 950 r/min with grease (a 150 r/min band), lubrication choice for NU2264 is a thermal decision, not just a sealing one. Equivalent-load planning treats NU2264 as a pure radial bearing: keep P below 2830 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU2264.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g NU2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 150 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 320 mm inner ring.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NU2264: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU2264 skids at 950 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NU2264: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU2264?",
        "a": "NU2264 is an NTN NU single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU2264 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU2264 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU2264-ECML",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×580×150 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu2264",
      "NU2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU264",
    "series": "NU200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU264 on the 320×580 mm envelope, 92 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,000 r/min. Digit by digit, NU264 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 320 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Thermal planning around the 1,000 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 320 mm positions. Housing and shaft fillets must clear the ring chamfers of NU264; an oversized radius locks the ring on its face and tilts the 92 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NU264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NU264 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NU264 as printed, not to the bare size.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU264 skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1780/2390 kN pair here belongs to NU264 as printed, not to the bare size.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU264?",
        "a": "NU264 is an NTN NU single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU264 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU264 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU264-ECM",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 320×580×92 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu264",
      "NU264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP2264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP2264",
    "series": "NUP2200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 4350,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 168000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP2264 denotes a 320×580×150 mm (12.598 × 22.835 × 5.906 in) cylindrical roller bearing in the NUP2200 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP2264 floats or locates; the numeric remainder is the ISO 15 series and 320 mm bore reference, not a fit or clearance instruction. Minimum radial load matters: an unloaded NUP2264 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 8.8 kN-per-mm-bore figure (2830 kN over 320 mm) lets a NUP2264 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP2264.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 168000 g NUP2264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 150 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 320 mm inner ring.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Open NUP2264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Do not replace NUP2264 with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2830/4350 kN ratings, 340 kN Pu and 168000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP2264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP2264?",
        "a": "NUP2264 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 4350 kN, Pu 340 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 168000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP2264 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP2264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP2264 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP2264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP2264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup2264",
      "NUP2264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP264",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP264",
    "series": "NUP200-series",
    "type": "cylindrical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1780,
    "static_load_kN": 2390,
    "fatigue_load_limit_kN": 186,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP264 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1780 kN dynamic rating in the 320 mm bore. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 320 mm, with 580 mm OD and 92 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NUP264 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 5.6 kN-per-mm-bore figure (1780 kN over 320 mm) lets a NUP264 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 320 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 320 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 109000 g NUP264 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP264 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NUP264 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 320 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 580 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 320 mm bore share bore but not OD/width; check the full NUP200 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1780/2390 kN ratings, 186 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP264 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP264?",
        "a": "NUP264 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 92 mm width (12.598 × 22.835 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1780 kN, C0 2390 kN, Pu 186 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 109000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP264 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP264 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP264 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP264?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 390 mm, Ew 510 mm. The nominal bore/OD remain 320/580 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP264",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup264",
      "NUP264"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4968K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4968K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1410,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 252,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 51700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NNU4968K appears as a 340 mm bore single-row cylindrical roller bearing (1410 kN C / 3150 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Numbering ties NNU4968K to its envelope: type code NNU, series NNU4900, 340 mm bore; the 460×118 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NNU4968K. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NNU arrangements. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NNU4968K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 51700 g NNU4968K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1410/3150 kN pair here belongs to NNU4968K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4968K skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 460 mm race brinells and releases as vibration within hours.",
      "The 1410/3150 kN ratings, 252 kN Pu and 51700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4968K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4968K?",
        "a": "NNU4968K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 340 mm bore, 460 mm OD and 118 mm width (13.386 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1410 kN, C0 3150 kN, Pu 252 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 51700 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4968K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4968K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4968K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4968K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4968 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4968K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 379 mm. The nominal bore/OD remain 340/460 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4968K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4968k",
      "NNU4968K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1068",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 340 mm shaft NTN supplies N1068: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 1,200 r/min on grease and 1,400 r/min on oil. Numbering ties N1068 to its envelope: type code N, series N1000, 340 mm bore; the 520×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1068 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 3.4 kN-per-mm-bore figure (1160 kN over 340 mm) lets a N1068 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N1068 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g N1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1068 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1068 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 340 mm inner ring.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1068?",
        "a": "N1068 is an NTN N single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1068 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1068 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1068",
      "N1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1068",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ1068 on the 340×520 mm envelope, 82 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,200 r/min. Digit by digit, NJ1068 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 340 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,200 r/min grease and 1,400 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 340 mm bore. The 340 mm (13.386 in) bore and 520 mm (20.472 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 82 mm-wide ring. Housing and shaft fillets must clear the ring chamfers of NJ1068; an oversized radius locks the ring on its face and tilts the 82 mm-wide seat.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g NJ1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90.0 mm section at 340 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1160/1670 kN pair here belongs to NJ1068 as printed, not to the bare size.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 340 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 520×82 mm envelope matches.",
      "If the shaft must be located both ways, do not use NJ1068 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1068?",
        "a": "NJ1068 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1068 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1068 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1068",
      "NJ1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3068",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1800,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 251,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3068 denotes a 340×520×133 mm (13.386 × 20.472 × 5.236 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3068 floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3068 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Selection arithmetic: Pu 251 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.78 (3200/1800 kN) shows the high-static-capacity proportioning of this 340 mm bore. Heat the inner ring to max 120 °C for the 340 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 102000 g NN3068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3068 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 340 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 520 mm race brinells and releases as vibration within hours.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NN3068: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1800/3200 kN ratings, 251 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3068?",
        "a": "NN3068 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 3200 kN, Pu 251 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 102000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3068 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3068?",
        "a": "NN3068 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3068?",
        "a": "NTN rates NN3068 at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3068",
      "NN3068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3068K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3068K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1800,
    "static_load_kN": 3200,
    "fatigue_load_limit_kN": 251,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 98500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3068K is the standard section of the NTN NN3000 dimension series for a 340 mm shaft — 1800 kN of basic dynamic capacity in a 98500 g, open bearing. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3068K floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. At 1,300 r/min with oil versus 1,100 r/min with grease (a 200 r/min band), lubrication choice for NN3068K is a thermal decision, not just a sealing one. The 5.3 kN-per-mm-bore figure (1800 kN over 340 mm) lets a NN3068K interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3068K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 98500 g NN3068K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1800/3200 kN pair here belongs to NN3068K as printed, not to the bare size.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 520 mm race brinells and releases as vibration within hours.",
      "Do not replace NN3068K with a deep-groove ball bearing on rating alone: line contact gives 1800 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NN3068K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1800/3200 kN ratings, 251 kN Pu and 98500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3068K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3068K?",
        "a": "NN3068K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 3200 kN, Pu 251 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 98500 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3068K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3068K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3068K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3068K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3068 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3068K?",
        "a": "NTN rates NN3068K at 1,100 r/min with grease and 1,300 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3068K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3068k",
      "NN3068K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1068",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU1068 denotes a 340×520×82 mm (13.386 × 20.472 × 3.228 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1068 floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. The 82 mm width and 90.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 1,200 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,400 r/min for continuously high-duty 340 mm positions. Heat the inner ring to max 120 °C for the 340 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g NU1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU1068 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1068 skids at 1,200 r/min and fails by smearing long before L10 fatigue.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 340 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 520×82 mm envelope matches.",
      "Open NU1068 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 340 mm contact.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1068?",
        "a": "NU1068 is an NTN NU single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1068 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1068 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1068",
      "NU1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1068",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1068",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1160,
    "static_load_kN": 1670,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1400,
    "weight_g": 60800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP1068 denotes a 340×520×82 mm (13.386 × 20.472 × 3.228 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1068 floats or locates; the numeric remainder is the ISO 15 series and 340 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP1068 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NUP1068 as a pure radial bearing: keep P below 1160 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 340 mm bore, oil-lubricated arrangements toward 1,400 r/min need positive flow and drain design; the 60800 g NUP1068 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP1068 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1160/1670 kN pair here belongs to NUP1068 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 340 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1160/1670 kN ratings, 132 kN Pu and 60800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1068 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1068?",
        "a": "NUP1068 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 82 mm width (13.386 × 20.472 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1160 kN, C0 1670 kN, Pu 132 kN, grease limiting speed 1,200 r/min, oil 1,400 r/min, mass about 60800 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1068 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1068 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1068 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1068?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 385 mm, Ew 475 mm. The nominal bore/OD remain 340/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,200 r/min grease / 1,400 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1068",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1068",
      "NUP1068"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4972K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4972K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1430,
    "static_load_kN": 3250,
    "fatigue_load_limit_kN": 255,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 54400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4972K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1430 kN dynamic rating in the 360 mm bore. The leading NNU defines the rib arrangement (double row, ribbed outer ring, separable inner); the dimension-series digits and the two-digit bore code resolve to 360 mm, with 480 mm OD and 118 mm width from the ISO 15 general plan. Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Mass 54400 g for the 360×480×118 mm NNU4972K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NNU4972K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 54400 g NNU4972K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4972K skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4972K skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Open NNU4972K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "The 118 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 360 mm inner ring.",
      "The 1430/3250 kN ratings, 255 kN Pu and 54400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4972K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4972K?",
        "a": "NNU4972K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 360 mm bore, 480 mm OD and 118 mm width (14.173 × 18.898 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1430 kN, C0 3250 kN, Pu 255 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 54400 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4972K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4972K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4972K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4972K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4972 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4972K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 398 mm. The nominal bore/OD remain 360/480 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4972K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4972k",
      "NNU4972K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1072",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, N1072 appears as a 360 mm bore single-row cylindrical roller bearing (1190 kN C / 1750 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 360 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1072 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 360 mm (14.173 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 82 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a N1072 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g N1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open N1072 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "The N rib arrangement is not interchangeable with another prefix on the same 360 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×82 mm envelope matches.",
      "The 90.0 mm section at 360 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 82 mm-wide cavity.",
      "Do not replace N1072 with a deep-groove ball bearing on rating alone: line contact gives 1190 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1072?",
        "a": "N1072 is an NTN N single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1072 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1072 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1072",
      "N1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1072",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1072 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1190 kN dynamic rating in the 360 mm bore. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1072 floats or locates; the numeric remainder is the ISO 15 series and 360 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1072. Mass 63700 g for the 360×540×82 mm NJ1072 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NJ1072; an oversized radius locks the ring on its face and tilts the 82 mm-wide seat.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g NJ1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 82 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 360 mm inner ring.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NJ1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NJ1072 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1072?",
        "a": "NJ1072 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1072 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1072 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1072",
      "NJ1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3072",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1830,
    "static_load_kN": 3300,
    "fatigue_load_limit_kN": 258,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3072 on the 360×540 mm envelope, 134 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 1,000 r/min. Numbering ties NN3072 to its envelope: type code NN, series NN3000, 360 mm bore; the 540×134 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3072 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Speed ratio check: limiting 1,000 r/min is .83 of the 1,200 r/min oil value for NN3072; grease-churn heating closes that gap as fill quantity rises. Heat the inner ring to max 120 °C for the 360 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 107000 g NN3072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 360 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 540×134 mm envelope matches.",
      "The 134 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 360 mm inner ring.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3072 does not substitute a precision-class execution.",
      "Do not replace NN3072 with a deep-groove ball bearing on rating alone: line contact gives 1830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1830/3300 kN ratings, 258 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3072?",
        "a": "NN3072 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1830 kN, C0 3300 kN, Pu 258 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 107000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3072 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3072?",
        "a": "NN3072 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3072?",
        "a": "NTN rates NN3072 at 1,000 r/min with grease and 1,200 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3072",
      "NN3072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3072K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3072K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1830,
    "static_load_kN": 3300,
    "fatigue_load_limit_kN": 258,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3072K appears as a 360 mm bore single-row cylindrical roller bearing (1830 kN C / 3300 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3072K floats or locates; the numeric remainder is the ISO 15 series and 360 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NN3072K. The 360 mm (14.173 in) bore and 540 mm (21.26 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 134 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 360 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 103000 g NN3072K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3072K skids at 1,000 r/min and fails by smearing long before L10 fatigue.",
      "The K tapered bore of NN3072K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 540 mm race brinells and releases as vibration within hours.",
      "The 1830/3300 kN ratings, 258 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3072K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3072K?",
        "a": "NN3072K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1830 kN, C0 3300 kN, Pu 258 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 103000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3072K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3072K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3072K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3072K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3072 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3072K?",
        "a": "NTN rates NN3072K at 1,000 r/min with grease and 1,200 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3072K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3072k",
      "NN3072K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1072",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NU1072 on the 360×540 mm envelope, 82 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Numbering ties NU1072 to its envelope: type code NU, series NU1000, 360 mm bore; the 540×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 1,100 r/min grease and 1,300 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 360 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NU arrangements. Heat the inner ring to max 120 °C for the 360 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g NU1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NU1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 360 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 540×82 mm envelope matches.",
      "Open NU1072 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 360 mm contact.",
      "If the shaft must be located both ways, do not use NU1072 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1072?",
        "a": "NU1072 is an NTN NU single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1072 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1072 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1072-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1072",
      "NU1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1072",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1072",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1190,
    "static_load_kN": 1750,
    "fatigue_load_limit_kN": 136,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 63700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NUP1072 on the 360×540 mm envelope, 82 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 1,100 r/min. Numbering ties NUP1072 to its envelope: type code NUP, series NUP1000, 360 mm bore; the 540×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NUP1072 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 136 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.47 (1750/1190 kN) shows the high-static-capacity proportioning of this 360 mm bore. On NUP arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "fretting corrosion on a loose rotating shaft seat",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 360 mm bore, oil-lubricated arrangements toward 1,300 r/min need positive flow and drain design; the 63700 g NUP1072 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NUP1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 1,100 r/min and oil 1,300 r/min are different limits for NUP1072: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 360 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 540×82 mm envelope matches.",
      "Do not replace NUP1072 with a deep-groove ball bearing on rating alone: line contact gives 1190 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1190/1750 kN ratings, 136 kN Pu and 63700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1072 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1072?",
        "a": "NUP1072 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 82 mm width (14.173 × 21.26 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1190 kN, C0 1750 kN, Pu 136 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 63700 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1072 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1072 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1072 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1072?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 405 mm, Ew 495 mm. The nominal bore/OD remain 360/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,300 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1072",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1072",
      "NUP1072"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4976K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4976K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1810,
    "static_load_kN": 4050,
    "fatigue_load_limit_kN": 315,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 80600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 380 mm shaft NTN supplies NNU4976K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 1,000 r/min on grease and 1,200 r/min on oil. Numbering ties NNU4976K to its envelope: type code NNU, series NNU4900, 380 mm bore; the 520×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NNU4976K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NNU4976K as a pure radial bearing: keep P below 1810 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 380 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 80600 g NNU4976K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 380 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 520×140 mm envelope matches.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 380 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 520×140 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1810/4050 kN ratings, 315 kN Pu and 80600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4976K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4976K?",
        "a": "NNU4976K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 380 mm bore, 520 mm OD and 140 mm width (14.961 × 20.472 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1810 kN, C0 4050 kN, Pu 315 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 80600 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4976K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4976K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4976K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4976K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4976 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4976K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm. The nominal bore/OD remain 380/520 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,000 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4976K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4976k",
      "NNU4976K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1076",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number N1076 denotes a 380×560×82 mm (14.961 × 22.047 × 3.228 in) cylindrical roller bearing in the N1000 family, a pressed sheet-steel cage. Numbering ties N1076 to its envelope: type code N, series N1000, 380 mm bore; the 560×82 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1076 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Rating life at 1220 kN C assumes clean oil and adequate film; the 141 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g N1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace N1076 with a deep-groove ball bearing on rating alone: line contact gives 1220 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Open N1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 560 mm race brinells and releases as vibration within hours.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1076?",
        "a": "N1076 is an NTN N single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1076 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1076 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1076",
      "N1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1076",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1076 is the extra-light (10/49) section of the NTN NJ1000 dimension series for a 380 mm shaft — 1220 kN of basic dynamic capacity in a 66500 g, open bearing. Digit by digit, NJ1076 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 380 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 1,100 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 380 mm bore. The 3.2 kN-per-mm-bore figure (1220 kN over 380 mm) lets a NJ1076 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 380 mm shaft.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g NJ1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 560 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NJ1076 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1076 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "If the shaft must be located both ways, do not use NJ1076 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1076?",
        "a": "NJ1076 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1076 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1076 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1076-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1076",
      "NJ1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3076",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1870,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 265,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 1100,
    "weight_g": 113000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3076 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1870 kN dynamic rating in the 380 mm bore. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3076 floats or locates; the numeric remainder is the ISO 15 series and 380 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3076 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Equivalent-load planning treats NN3076 as a pure radial bearing: keep P below 1870 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3076.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 113000 g NN3076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3076 skids at 940 r/min and fails by smearing long before L10 fatigue.",
      "The 90.0 mm section at 380 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 135 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1870/3450 kN pair here belongs to NN3076 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1870/3450 kN ratings, 265 kN Pu and 113000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3076?",
        "a": "NN3076 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1870 kN, C0 3450 kN, Pu 265 kN, grease limiting speed 940 r/min, oil 1,100 r/min, mass about 113000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3076 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3076?",
        "a": "NN3076 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3076?",
        "a": "NTN rates NN3076 at 940 r/min with grease and 1,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3076",
      "NN3076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3076K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3076K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1870,
    "static_load_kN": 3450,
    "fatigue_load_limit_kN": 265,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 1100,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3076K belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1870 kN dynamic rating in the 380 mm bore. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 380 mm, with 560 mm OD and 135 mm width from the ISO 15 general plan. The 135 mm width and 90.0 mm section put the NN3000 series in the standard section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Mass 109000 g for the 380×560×135 mm NN3076K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3076K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 109000 g NN3076K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1870/3450 kN pair here belongs to NN3076K as printed, not to the bare size.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 380 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 560×135 mm envelope matches.",
      "Grease limiting speed 940 r/min and oil 1,100 r/min are different limits for NN3076K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NN3076K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "The 1870/3450 kN ratings, 265 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3076K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3076K?",
        "a": "NN3076K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1870 kN, C0 3450 kN, Pu 265 kN, grease limiting speed 940 r/min, oil 1,100 r/min, mass about 109000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3076K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3076K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3076K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3076K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3076 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3076K?",
        "a": "NTN rates NN3076K at 940 r/min with grease and 1,100 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3076K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3076k",
      "NN3076K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1076",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1076 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1220 kN dynamic rating in the 380 mm bore. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1076 floats or locates; the numeric remainder is the ISO 15 series and 380 mm bore reference, not a fit or clearance instruction. The 82 mm width and 90.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 1,100 r/min is .92 of the 1,200 r/min oil value for NU1076; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1076.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g NU1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1220/1840 kN pair here belongs to NU1076 as printed, not to the bare size.",
      "Open NU1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NU1076 skids at 1,100 r/min and fails by smearing long before L10 fatigue.",
      "Open NU1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1076?",
        "a": "NU1076 is an NTN NU single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1076 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1076 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1076-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1076",
      "NU1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1076",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1076",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1840,
    "fatigue_load_limit_kN": 141,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1200,
    "weight_g": 66500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1076 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1220 kN dynamic rating in the 380 mm bore. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1076 floats or locates; the numeric remainder is the ISO 15 series and 380 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NUP1076 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 66500 g for the 380×560×82 mm NUP1076 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Housing and shaft fillets must clear the ring chamfers of NUP1076; an oversized radius locks the ring on its face and tilts the 82 mm-wide seat.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 380 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 66500 g NUP1076 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1220/1840 kN pair here belongs to NUP1076 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NUP1076 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NUP1076 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 380 mm contact.",
      "Wide (22/23) and light (10/49) executions at 380 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1220/1840 kN ratings, 141 kN Pu and 66500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1076 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1076?",
        "a": "NUP1076 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 82 mm width (14.961 × 22.047 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1840 kN, Pu 141 kN, grease limiting speed 1,100 r/min, oil 1,200 r/min, mass about 66500 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1076 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1076 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1076 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1076?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 425 mm, Ew 515 mm. The nominal bore/OD remain 380/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 1,100 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1076",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1076",
      "NUP1076"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4980K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4980K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1870,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 940,
    "max_rpm": 940,
    "speed_oil_rpm": 1100,
    "weight_g": 84100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NNU4980K on the 400×540 mm envelope, 140 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 940 r/min. Numbering ties NNU4980K to its envelope: type code NNU, series NNU4900, 400 mm bore; the 540×140 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. At 1,100 r/min with oil versus 940 r/min with grease (a 160 r/min band), lubrication choice for NNU4980K is a thermal decision, not just a sealing one. Selection arithmetic: Pu 325 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 2.30 (4300/1870 kN) shows the high-static-capacity proportioning of this 400 mm bore. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 400 mm shaft.",
    "applications": [
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "false brinelling on standby machines exposed to external vibration",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 84100 g NNU4980K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4980K skids at 940 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 940 r/min and oil 1,100 r/min are different limits for NNU4980K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4980K skids at 940 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 940 r/min and oil 1,100 r/min are different limits for NNU4980K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 1870/4300 kN ratings, 325 kN Pu and 84100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4980K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4980K?",
        "a": "NNU4980K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 400 mm bore, 540 mm OD and 140 mm width (15.748 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1870 kN, C0 4300 kN, Pu 325 kN, grease limiting speed 940 r/min, oil 1,100 r/min, mass about 84100 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4980K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4980K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4980K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4980K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4980 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4980K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 445 mm. The nominal bore/OD remain 400/540 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 940 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4980K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4980k",
      "NNU4980K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1080",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists N1080 on the 400×600 mm envelope, 90 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 990 r/min. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 400 mm (00–03 use the 10/12/15/17 exception table). Minimum radial load matters: an unloaded N1080 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. The 3.6 kN-per-mm-bore figure (1460 kN over 400 mm) lets a N1080 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. On N arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g N1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1080 skids at 990 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace N1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1080?",
        "a": "N1080 is an NTN N single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1080 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1080 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1080",
      "N1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1080",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NJ1080 is an NTN NJ cylindrical roller bearing: two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction, inside the 400×600×90 mm ISO 15 envelope. On the NTN nameplate NJ states which ring carries the ribs, which determines whether NJ1080 floats or locates; the numeric remainder is the ISO 15 series and 400 mm bore reference, not a fit or clearance instruction. NTN ships these bearings open with normal (CN) radial clearance and P0 tolerance as standard; precision classes and C3/C4 clearance are separate order suffixes, not part of NJ1080. The 400 mm (15.748 in) bore and 600 mm (23.622 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 90 mm-wide ring. The NJ design locates in one direction only: for two-direction location fit the matching loose rib ring (NUP execution) or pair the bearings back to back on the 400 mm shaft.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g NJ1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100.0 mm section at 400 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 90 mm-wide cavity.",
      "Do not replace NJ1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Do not replace NJ1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 600 mm race brinells and releases as vibration within hours.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1080?",
        "a": "NJ1080 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1080 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1080 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1080-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1080",
      "NJ1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3080",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4150,
    "fatigue_load_limit_kN": 310,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1000,
    "weight_g": 146000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3080 is the standard section of the NTN NN3000 dimension series for a 400 mm shaft — 2260 kN of basic dynamic capacity in a 146000 g, open bearing. Numbering ties NN3080 to its envelope: type code NN, series NN3000, 400 mm bore; the 600×148 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Minimum radial load matters: an unloaded NN3080 at high speed skids its rollers and smears the raceway; spring preload or the rotor weight typically covers the requirement in motors and pumps. Selection arithmetic: Pu 310 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.84 (4150/2260 kN) shows the high-static-capacity proportioning of this 400 mm bore. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NN3080.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 146000 g NN3080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NN3080 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 400 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2260/4150 kN pair here belongs to NN3080 as printed, not to the bare size.",
      "The 148 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 400 mm inner ring.",
      "Do not replace NN3080 with a deep-groove ball bearing on rating alone: line contact gives 2260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 2260/4150 kN ratings, 310 kN Pu and 146000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3080?",
        "a": "NN3080 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4150 kN, Pu 310 kN, grease limiting speed 880 r/min, oil 1,000 r/min, mass about 146000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3080 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3080?",
        "a": "NN3080 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3080?",
        "a": "NTN rates NN3080 at 880 r/min with grease and 1,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3080",
      "NN3080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3080K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3080K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4150,
    "fatigue_load_limit_kN": 310,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1000,
    "weight_g": 141000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 400 mm shaft NTN supplies NN3080K: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 880 r/min on grease and 1,000 r/min on oil. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3080K floats or locates; the numeric remainder is the ISO 15 series and 400 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3080K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 880 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,000 r/min for continuously high-duty 400 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 400 mm shaft.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "rolling-contact fatigue after the catalogue L10 life is exceeded",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 141000 g NN3080K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3080K skids at 880 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 880 r/min and oil 1,000 r/min are different limits for NN3080K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NN3080K with a deep-groove ball bearing on rating alone: line contact gives 2260 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2260/4150 kN ratings, 310 kN Pu and 141000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3080K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3080K?",
        "a": "NN3080K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4150 kN, Pu 310 kN, grease limiting speed 880 r/min, oil 1,000 r/min, mass about 141000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3080K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3080K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3080K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3080K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3080 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3080K?",
        "a": "NTN rates NN3080K at 880 r/min with grease and 1,000 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3080K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3080k",
      "NN3080K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1080",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1080 is the extra-light (10/49) section of the NTN NU1000 dimension series for a 400 mm shaft — 1460 kN of basic dynamic capacity in a 86300 g, open bearing. Numbering ties NU1080 to its envelope: type code NU, series NU1000, 400 mm bore; the 600×90 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 990 r/min grease and 1,200 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 400 mm bore. Thermal planning around the 990 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,200 r/min for continuously high-duty 400 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU1080.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g NU1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NU1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Do not replace NU1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NU1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1080?",
        "a": "NU1080 is an NTN NU single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1080 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1080 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1080-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1080",
      "NU1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1080",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1080",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1460,
    "static_load_kN": 2190,
    "fatigue_load_limit_kN": 164,
    "limiting_speed_rpm": 990,
    "max_rpm": 990,
    "speed_oil_rpm": 1200,
    "weight_g": 86300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1080 is the extra-light (10/49) section of the NTN NUP1000 dimension series for a 400 mm shaft — 1460 kN of basic dynamic capacity in a 86300 g, open bearing. Numbering ties NUP1080 to its envelope: type code NUP, series NUP1000, 400 mm bore; the 600×90 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NUP1080 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 990 r/min is .82 of the 1,200 r/min oil value for NUP1080; grease-churn heating closes that gap as fill quantity rises. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 400 mm shaft.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 400 mm bore, oil-lubricated arrangements toward 1,200 r/min need positive flow and drain design; the 86300 g NUP1080 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use NUP1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Do not replace NUP1080 with a deep-groove ball bearing on rating alone: line contact gives 1460 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "If the shaft must be located both ways, do not use NUP1080 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 400 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1460/2190 kN ratings, 164 kN Pu and 86300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1080 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1080?",
        "a": "NUP1080 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 90 mm width (15.748 × 23.622 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1460 kN, C0 2190 kN, Pu 164 kN, grease limiting speed 990 r/min, oil 1,200 r/min, mass about 86300 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1080 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1080 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1080 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1080?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 450 mm, Ew 550 mm. The nominal bore/OD remain 400/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 990 r/min grease / 1,200 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1080",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1080",
      "NUP1080"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4984K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4984K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1930,
    "static_load_kN": 4500,
    "fatigue_load_limit_kN": 340,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 87700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4984K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 420×560×140 mm ISO 15 envelope. Digit by digit, NNU4984K reads as NNU (double row, ribbed outer ring, separable inner), ISO 15 series, and bore 420 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. Double-row NNU precision cylindrical roller bearing: ribbed outer ring with a separable inner ring, two roller rows for high radial stiffness on machine-tool spindles; the K suffix is a 1:12 tapered bore — mounted on a tapered seat or adapter sleeve and driven up to a precise radial clearance/preload; precision classes P5/P4/P2 and clearance are ordered separately. Speed ratio check: limiting 900 r/min is .82 of the 1,100 r/min oil value for NNU4984K; grease-churn heating closes that gap as fill quantity rises. Housing and shaft fillets must clear the ring chamfers of NNU4984K; an oversized radius locks the ring on its face and tilts the 140 mm-wide seat.",
    "applications": [
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 87700 g NNU4984K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4984K skids at 900 r/min and fails by smearing long before L10 fatigue.",
      "Open NNU4984K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 420 mm contact.",
      "The 140 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "The 1930/4500 kN ratings, 340 kN Pu and 87700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4984K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4984K?",
        "a": "NNU4984K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 420 mm bore, 560 mm OD and 140 mm width (16.535 × 22.047 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1930 kN, C0 4500 kN, Pu 340 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 87700 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4984K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4984K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4984K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4984K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4984 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4984K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 465 mm. The nominal bore/OD remain 420/560 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4984K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4984k",
      "NNU4984K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1084",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1084 belongs to the NTN cylindrical roller range in NTN Ball and Roller Bearings CAT.No.2203E: line-contact rollers between ground raceways for a 1500 kN dynamic rating in the 420 mm bore. Numbering ties N1084 to its envelope: type code N, series N1000, 420 mm bore; the 620×90 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1084 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating N arrangements. Housing and shaft fillets must clear the ring chamfers of N1084; an oversized radius locks the ring on its face and tilts the 90 mm-wide seat.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g N1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for N1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The N rib arrangement is not interchangeable with another prefix on the same 420 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 620×90 mm envelope matches.",
      "The N rib arrangement is not interchangeable with another prefix on the same 420 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 620×90 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1084?",
        "a": "N1084 is an NTN N single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1084 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1084 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1084",
      "N1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1084",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 420 mm shaft NTN supplies NJ1084: two integral ribs on the inner ring and one rib on the outer ring; the open execution is rated 950 r/min on grease and 1,100 r/min on oil. Digit by digit, NJ1084 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 420 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 950 r/min grease and 1,100 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 420 mm bore. Rating life at 1500 kN C assumes clean oil and adequate film; the 170 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. Heat the inner ring to max 120 °C for the 420 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g NJ1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NJ1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NJ1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NJ1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "If the shaft must be located both ways, do not use NJ1084 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1084?",
        "a": "NJ1084 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1084 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1084 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1084",
      "NJ1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3084",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2300,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 320,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 990,
    "weight_g": 154000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3084 is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 420×620×150 mm ISO 15 envelope. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3084 floats or locates; the numeric remainder is the ISO 15 series and 420 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3084 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Mass 154000 g for the 420×620×150 mm NN3084 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Keep the open bearing wrapped until fitting: the line-contact raceways of the 420 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 990 r/min need positive flow and drain design; the 154000 g NN3084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3084 with a deep-groove ball bearing on rating alone: line contact gives 2300 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The 150 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "The 100.0 mm section at 420 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 150 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2300/4300 kN ratings, 320 kN Pu and 154000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3084?",
        "a": "NN3084 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2300 kN, C0 4300 kN, Pu 320 kN, grease limiting speed 840 r/min, oil 990 r/min, mass about 154000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3084 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3084?",
        "a": "NN3084 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3084?",
        "a": "NTN rates NN3084 at 840 r/min with grease and 990 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3084",
      "NN3084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3084K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3084K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2300,
    "static_load_kN": 4300,
    "fatigue_load_limit_kN": 320,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 990,
    "weight_g": 148000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NN3084K on the 420×620 mm envelope, 150 mm wide: a line-contact radial bearing with a machined or stamped steel cage per the precision execution and a grease limiting speed of 840 r/min. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 420 mm, with 620 mm OD and 150 mm width from the ISO 15 general plan. With C 2300 kN and C0 4300 kN (C0/C ≈ 1.87) the bearing is proportioned for heavy radial load; the NU design carries no axial load and floats axially on both sides. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NN arrangements. Housing and shaft fillets must clear the ring chamfers of NN3084K; an oversized radius locks the ring on its face and tilts the 150 mm-wide seat.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 990 r/min need positive flow and drain design; the 148000 g NN3084K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 420 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3084K skids at 840 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3084K skids at 840 r/min and fails by smearing long before L10 fatigue.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NN3084K skids at 840 r/min and fails by smearing long before L10 fatigue.",
      "The 2300/4300 kN ratings, 320 kN Pu and 148000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3084K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3084K?",
        "a": "NN3084K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2300 kN, C0 4300 kN, Pu 320 kN, grease limiting speed 840 r/min, oil 990 r/min, mass about 148000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3084K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3084K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3084K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3084K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3084 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3084K?",
        "a": "NTN rates NN3084K at 840 r/min with grease and 990 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3084K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3084k",
      "NN3084K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1084",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NU1084 is an NTN NU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 420×620×90 mm ISO 15 envelope. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1084 floats or locates; the numeric remainder is the ISO 15 series and 420 mm bore reference, not a fit or clearance instruction. The 90 mm width and 100.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Selection arithmetic: Pu 170 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.53 (2290/1500 kN) shows the high-static-capacity proportioning of this 420 mm bore. Keep the open bearing wrapped until fitting: the line-contact raceways of the 420 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g NU1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 420 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 620×90 mm envelope matches.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NU1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open NU1084 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 420 mm contact.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1084?",
        "a": "NU1084 is an NTN NU single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1084 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1084 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1084-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1084",
      "NU1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1084",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1084",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1500,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 170,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1100,
    "weight_g": 89600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NUP1084 is an NTN NUP cylindrical roller bearing: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions, inside the 420×620×90 mm ISO 15 envelope. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1084 floats or locates; the numeric remainder is the ISO 15 series and 420 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Equivalent-load planning treats NUP1084 as a pure radial bearing: keep P below 1500 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. Heat the inner ring to max 120 °C for the 420 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 420 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 89600 g NUP1084 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 90 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 420 mm inner ring.",
      "Grease limiting speed 950 r/min and oil 1,100 r/min are different limits for NUP1084: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1500/2290 kN pair here belongs to NUP1084 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1500/2290 kN pair here belongs to NUP1084 as printed, not to the bare size.",
      "The 1500/2290 kN ratings, 170 kN Pu and 89600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1084 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1084?",
        "a": "NUP1084 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 90 mm width (16.535 × 24.409 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1500 kN, C0 2290 kN, Pu 170 kN, grease limiting speed 950 r/min, oil 1,100 r/min, mass about 89600 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1084 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1084 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1084 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1084?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 470 mm, Ew 570 mm. The nominal bore/OD remain 420/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 950 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1084",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1084",
      "NUP1084"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4988K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4988K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2380,
    "static_load_kN": 5550,
    "fatigue_load_limit_kN": 410,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 121000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NNU4988K denotes a 440×600×160 mm (17.323 × 23.622 × 6.299 in) cylindrical roller bearing in the NNU4900 family, a machined or stamped steel cage per the precision execution. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 440 mm (00–03 use the 10/12/15/17 exception table). Line contact between rollers and raceways gives NNU4988K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 850 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 1,000 r/min for continuously high-duty 440 mm positions. On NNU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 121000 g NNU4988K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 160 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 440 mm inner ring.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 440 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 600×160 mm envelope matches.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 440 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 600×160 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 440 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2380/5550 kN ratings, 410 kN Pu and 121000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4988K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4988K?",
        "a": "NNU4988K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 440 mm bore, 600 mm OD and 160 mm width (17.323 × 23.622 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2380 kN, C0 5550 kN, Pu 410 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 121000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4988K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4988K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4988K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4988K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4988 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4988K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 492 mm. The nominal bore/OD remain 440/600 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4988K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4988k",
      "NNU4988K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1088",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1088 is the extra-light (10/49) section of the NTN N1000 dimension series for a 440 mm shaft — 1590 kN of basic dynamic capacity in a 103000 g, open bearing. On the NTN nameplate N states which ring carries the ribs, which determines whether N1088 floats or locates; the numeric remainder is the ISO 15 series and 440 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Speed ratio check: limiting 900 r/min is .82 of the 1,100 r/min oil value for N1088; grease-churn heating closes that gap as fill quantity rises. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 440 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g N1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2430 kN pair here belongs to N1088 as printed, not to the bare size.",
      "Open N1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "Open N1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1590/2430 kN pair here belongs to N1088 as printed, not to the bare size.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1088?",
        "a": "N1088 is an NTN N single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1088 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1088 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1088",
      "N1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1088",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ1088 appears as a 440 mm bore single-row cylindrical roller bearing (1590 kN C / 2430 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 440 mm, with 650 mm OD and 94 mm width from the ISO 15 general plan. The 94 mm width and 105.0 mm section put the NJ1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Thermal planning around the 900 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,100 r/min for continuously high-duty 440 mm positions. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1088.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g NJ1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NJ1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "If the shaft must be located both ways, do not use NJ1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "If the shaft must be located both ways, do not use NJ1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Open NJ1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1088?",
        "a": "NJ1088 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1088 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1088 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1088",
      "NJ1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3088",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2680,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 370,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 940,
    "weight_g": 178000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 440 mm shaft NTN supplies NN3088: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 800 r/min on grease and 940 r/min on oil. Digit by digit, NN3088 reads as NN (double row, ribbed inner ring, separable outer), ISO 15 series, and bore 440 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. The 6.1 kN-per-mm-bore figure (2680 kN over 440 mm) lets a NN3088 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3088 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 940 r/min need positive flow and drain design; the 178000 g NN3088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Double-row NN precision bearings are typically ordered P5/P4 with specific radial clearance for spindle preloading; a P0/CN NN3088 does not substitute a precision-class execution.",
      "The 105.0 mm section at 440 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 157 mm-wide cavity.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2680/5100 kN pair here belongs to NN3088 as printed, not to the bare size.",
      "The 2680/5100 kN ratings, 370 kN Pu and 178000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3088?",
        "a": "NN3088 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2680 kN, C0 5100 kN, Pu 370 kN, grease limiting speed 800 r/min, oil 940 r/min, mass about 178000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3088 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3088?",
        "a": "NN3088 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3088?",
        "a": "NTN rates NN3088 at 800 r/min with grease and 940 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3088",
      "NN3088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3088K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3088K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2680,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 370,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 940,
    "weight_g": 172000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NN3088K is an NTN NN cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 440×650×157 mm ISO 15 envelope. Numbering ties NN3088K to its envelope: type code NN, series NN3000, 440 mm bore; the 650×157 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. NTN prints two speed ceilings: 800 r/min grease and 940 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 440 mm bore. Rating life at 2680 kN C assumes clean oil and adequate film; the 370 kN Pu floor means contamination derating — not the C rating alone — governs adjusted life in dusty gearboxes. On NN arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 940 r/min need positive flow and drain design; the 172000 g NN3088K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 157 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 440 mm inner ring.",
      "The NN rib arrangement is not interchangeable with another prefix on the same 440 mm seat: double row, ribbed inner ring, separable outer. Swapping NU for NJ changes axial location behaviour even though the 650×157 mm envelope matches.",
      "Open NN3088K units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "The K tapered bore of NN3088K is driven up to a measured clearance: skipping the drive-up procedure in favour of a normal press fit leaves the precision spindle set either preloaded hot or loose under load.",
      "The 2680/5100 kN ratings, 370 kN Pu and 172000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3088K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3088K?",
        "a": "NN3088K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2680 kN, C0 5100 kN, Pu 370 kN, grease limiting speed 800 r/min, oil 940 r/min, mass about 172000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3088K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3088K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3088K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3088K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3088 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3088K?",
        "a": "NTN rates NN3088K at 800 r/min with grease and 940 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3088K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3088k",
      "NN3088K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1088",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 440 mm shaft NTN supplies NU1088: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 900 r/min on grease and 1,100 r/min on oil. Digit by digit, NU1088 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 440 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 105.0 mm radial section ((650−440)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. Mass 103000 g for the 440×650×94 mm NU1088 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1088 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g NU1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "Open NU1088 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 440 mm contact.",
      "If the shaft must be located both ways, do not use NU1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 105.0 mm section at 440 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 94 mm-wide cavity.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1088?",
        "a": "NU1088 is an NTN NU single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1088 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1088 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1088",
      "NU1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1088",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1088",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 94,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1590,
    "static_load_kN": 2430,
    "fatigue_load_limit_kN": 178,
    "limiting_speed_rpm": 900,
    "max_rpm": 900,
    "speed_oil_rpm": 1100,
    "weight_g": 103000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 440 mm shaft NTN supplies NUP1088: the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring; the open execution is rated 900 r/min on grease and 1,100 r/min on oil. Digit by digit, NUP1088 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 440 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1590 kN and C0 2430 kN (C0/C ≈ 1.53) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 440 mm (17.323 in) bore and 650 mm (25.591 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 94 mm-wide ring. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1088.",
    "applications": [
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 440 mm bore, oil-lubricated arrangements toward 1,100 r/min need positive flow and drain design; the 103000 g NUP1088 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "If the shaft must be located both ways, do not use NUP1088 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 94 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 440 mm inner ring.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1088 skids at 900 r/min and fails by smearing long before L10 fatigue.",
      "The 1590/2430 kN ratings, 178 kN Pu and 103000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1088 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1088?",
        "a": "NUP1088 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 94 mm width (17.323 × 25.591 × 3.701 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1590 kN, C0 2430 kN, Pu 178 kN, grease limiting speed 900 r/min, oil 1,100 r/min, mass about 103000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1088 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1088 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1088 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1088?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 493 mm, Ew 597 mm. The nominal bore/OD remain 440/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 900 r/min grease / 1,100 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1088",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=154",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1088",
      "NUP1088"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4992K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4992K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2460,
    "static_load_kN": 5850,
    "fatigue_load_limit_kN": 430,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 950,
    "weight_g": 126000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU4992K is the extra-light (10/49) section of the NTN NNU4900 dimension series for a 460 mm shaft — 2460 kN of basic dynamic capacity in a 126000 g, open bearing. Digit by digit, NNU4992K reads as NNU (double row, ribbed outer ring, separable inner), ISO 15 series, and bore 460 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 80.0 mm radial section ((620−460)/2) frames the roller complement; capacity per millimetre of bore is about 5.3 kN/mm before application factors. The 460 mm (18.11 in) bore and 620 mm (24.409 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 160 mm-wide ring. Keep the open bearing wrapped until fitting: the line-contact raceways of the 460 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 950 r/min need positive flow and drain design; the 126000 g NNU4992K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NNU4992K with a deep-groove ball bearing on rating alone: line contact gives 2460 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 800 r/min and oil 950 r/min are different limits for NNU4992K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NNU4900 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 80.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 160 mm-wide cavity.",
      "The 2460/5850 kN ratings, 430 kN Pu and 126000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4992K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4992K?",
        "a": "NNU4992K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 460 mm bore, 620 mm OD and 160 mm width (18.11 × 24.409 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2460 kN, C0 5850 kN, Pu 430 kN, grease limiting speed 800 r/min, oil 950 r/min, mass about 126000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4992K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4992K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4992K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4992K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4992 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4992K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 512 mm. The nominal bore/OD remain 460/620 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 800 r/min grease / 950 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4992K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4992k",
      "NNU4992K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1092",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N1092 is an NTN N cylindrical roller bearing: two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side, inside the 460×680×100 mm ISO 15 envelope. Numbering ties N1092 to its envelope: type code N, series N1000, 460 mm bore; the 680×100 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives N1092 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 850 r/min grease ceiling should include the cage type (a pressed sheet-steel cage) and oil-flow option to 1,000 r/min for continuously high-duty 460 mm positions. Provide axial location with an adjacent locating bearing rather than expecting the float cylindrical set to hold thrust on the 460 mm shaft.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "fretting corrosion on a loose rotating shaft seat",
      "fretting corrosion on a loose rotating shaft seat"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g N1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "If the shaft must be located both ways, do not use N1092 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N1092 skids at 850 r/min and fails by smearing long before L10 fatigue.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full N1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1092?",
        "a": "N1092 is an NTN N single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1092 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1092 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1092",
      "N1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1092",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NJ1092 denotes a 460×680×100 mm (18.11 × 26.772 × 3.937 in) cylindrical roller bearing in the NJ1000 family, a pressed sheet-steel cage. Digit by digit, NJ1092 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 460 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints two speed ceilings: 850 r/min grease and 1,000 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 460 mm bore. With the inner ring rotating, catalogue practice is a m6/n6 shaft seat and an H7/H6 housing; the outer ring must remain free to creep slightly axially in non-locating NJ arrangements. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NJ1092.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "fretting corrosion on a loose rotating shaft seat",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g NJ1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 460 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 680×100 mm envelope matches.",
      "Do not replace NJ1092 with a deep-groove ball bearing on rating alone: line contact gives 1710 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1710/2630 kN pair here belongs to NJ1092 as printed, not to the bare size.",
      "If the shaft must be located both ways, do not use NJ1092 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1092?",
        "a": "NJ1092 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1092 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1092 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1092",
      "NJ1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3092",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 5350,
    "fatigue_load_limit_kN": 385,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 890,
    "weight_g": 202000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NN3092 appears as a 460 mm bore single-row cylindrical roller bearing (2830 kN C / 5350 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. On the NTN nameplate NN states which ring carries the ribs, which determines whether NN3092 floats or locates; the numeric remainder is the ISO 15 series and 460 mm bore reference, not a fit or clearance instruction. Line contact between rollers and raceways gives NN3092 high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. The 460 mm (18.11 in) bore and 680 mm (26.772 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 163 mm-wide ring. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3092 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings",
      "high-speed turbine and turbo-blower rotor supports"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 890 r/min need positive flow and drain design; the 202000 g NN3092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 750 r/min and oil 890 r/min are different limits for NN3092: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 2830/5350 kN pair here belongs to NN3092 as printed, not to the bare size.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2830/5350 kN ratings, 385 kN Pu and 202000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3092?",
        "a": "NN3092 is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 5350 kN, Pu 385 kN, grease limiting speed 750 r/min, oil 890 r/min, mass about 202000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3092 is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3092?",
        "a": "NN3092 has a cylindrical bore and mounts on a plain machined shaft seat; a K execution (1:12 taper) exists in the NN3000 series when preload must be set by drive-up on a tapered seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3092?",
        "a": "NTN rates NN3092 at 750 r/min with grease and 890 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3092",
      "NN3092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NN3092K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NN3092K",
    "series": "NN3000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2830,
    "static_load_kN": 5350,
    "fatigue_load_limit_kN": 385,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 890,
    "weight_g": 195000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NN3092K denotes a 460×680×163 mm (18.11 × 26.772 × 6.417 in) cylindrical roller bearing in the NN3000 family, a machined or stamped steel cage per the precision execution. The leading NN defines the rib arrangement (double row, ribbed inner ring, separable outer); the dimension-series digits and the two-digit bore code resolve to 460 mm, with 680 mm OD and 163 mm width from the ISO 15 general plan. Line contact between rollers and raceways gives NN3092K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Speed ratio check: limiting 750 r/min is .84 of the 890 r/min oil value for NN3092K; grease-churn heating closes that gap as fill quantity rises. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NN3092K non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "false brinelling on standby machines exposed to external vibration",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 890 r/min need positive flow and drain design; the 195000 g NN3092K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Do not replace NN3092K with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Grease limiting speed 750 r/min and oil 890 r/min are different limits for NN3092K: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Do not replace NN3092K with a deep-groove ball bearing on rating alone: line contact gives 2830 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NN3000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2830/5350 kN ratings, 385 kN Pu and 195000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NN3092K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NN3092K?",
        "a": "NN3092K is an NTN NN double-row precision cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 5350 kN, Pu 385 kN, grease limiting speed 750 r/min, oil 890 r/min, mass about 195000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NN3092K is the NN execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NN3092K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NN bearing like NN3092K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NN3092K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NN3092 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What speeds and lubrication apply to NN3092K?",
        "a": "NTN rates NN3092K at 750 r/min with grease and 890 r/min with oil. The grease figure is the cage/film mechanical ceiling; the oil figure assumes circulating or carefully supplied oil that removes heat from the line-contact zone."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NN3092K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nn3092k",
      "NN3092K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1092",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NU1092 appears as a 460 mm bore single-row cylindrical roller bearing (1710 kN C / 2630 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU1092 floats or locates; the numeric remainder is the ISO 15 series and 460 mm bore reference, not a fit or clearance instruction. The 100 mm width and 110.0 mm section put the NU1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Equivalent-load planning treats NU1092 as a pure radial bearing: keep P below 1710 kN at the required L10, and let a paired angular-contact or thrust part carry any sustained axial component. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NU1092 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage distortion after a mounting blow carried through the roller set",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g NU1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Wide (22/23) and light (10/49) executions at 460 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1710/2630 kN pair here belongs to NU1092 as printed, not to the bare size.",
      "Open NU1092 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 460 mm contact.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1092?",
        "a": "NU1092 is an NTN NU single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1092 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1092 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1092-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1092",
      "NU1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1092",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1092",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1000,
    "weight_g": 120000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NUP1092 appears as a 460 mm bore single-row cylindrical roller bearing (1710 kN C / 2630 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. On the NTN nameplate NUP states which ring carries the ribs, which determines whether NUP1092 floats or locates; the numeric remainder is the ISO 15 series and 460 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Mass 120000 g for the 460×680×100 mm NUP1092 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NUP1092.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 460 mm bore, oil-lubricated arrangements toward 1,000 r/min need positive flow and drain design; the 120000 g NUP1092 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 110.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "Do not replace NUP1092 with a deep-groove ball bearing on rating alone: line contact gives 1710 kN radial capacity but the bearing only accepts small sustained axial guidance loads and misalignment tolerance is only 3–4 arc-minutes.",
      "The 110.0 mm section at 460 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1710/2630 kN pair here belongs to NUP1092 as printed, not to the bare size.",
      "The 1710/2630 kN ratings, 191 kN Pu and 120000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1092 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1092?",
        "a": "NUP1092 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 100 mm width (18.11 × 26.772 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2630 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,000 r/min, mass about 120000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1092 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1092 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1092 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1092?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 516 mm, Ew 624 mm. The nominal bore/OD remain 460/680 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 850 r/min grease / 1,000 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1092",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1092",
      "NUP1092"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU4996K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU4996K",
    "series": "NNU4900-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2530,
    "static_load_kN": 5900,
    "fatigue_load_limit_kN": 425,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 149000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NNU4996K appears as a 480 mm bore single-row cylindrical roller bearing (2530 kN C / 5900 kN C0) with a machined or stamped steel cage per the precision execution, listed to the ISO 15 boundary plan. Reading the code: NNU for the double-row precision type, then the ISO 15 diameter/width series and the bore code — ×5 = 480 mm (00–03 use the 10/12/15/17 exception table). NTN prints the raceway diameters for this size — Fw 534 mm — the envelope inside the 480/650 mm bore/OD where the rollers actually run. Mass 149000 g for the 480×650×170 mm NNU4996K execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NNU4996K.",
    "applications": [
      "high-speed turbine and turbo-blower rotor supports",
      "coordinate-measuring and semiconductor-equipment drives",
      "machine-tool main spindles requiring high radial stiffness",
      "precision gearbox and indexing-drive shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "false brinelling on standby machines exposed to external vibration"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 149000 g NNU4996K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 480 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 650×170 mm envelope matches.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NNU4996K skids at 770 r/min and fails by smearing long before L10 fatigue.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 650 mm race brinells and releases as vibration within hours.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 480 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 650×170 mm envelope matches.",
      "The 2530/5900 kN ratings, 425 kN Pu and 149000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU4996K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU4996K?",
        "a": "NNU4996K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 480 mm bore, 650 mm OD and 170 mm width (18.898 × 25.591 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2530 kN, C0 5900 kN, Pu 425 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 149000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU4996K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU4996K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU4996K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU4996K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU4996 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU4996K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 534 mm. The nominal bore/OD remain 480/650 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU4996K",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu4996k",
      "NNU4996K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN N1096",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 480 mm shaft NTN supplies N1096: two integral ribs on the inner ring and a ribless separable outer ring; the open execution is rated 810 r/min on grease and 960 r/min on oil. On the NTN nameplate N states which ring carries the ribs, which determines whether N1096 floats or locates; the numeric remainder is the ISO 15 series and 480 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth. Selection arithmetic: Pu 197 kN is the fatigue load limit feeding the adjusted-life equation, and the C0/C ratio of 1.57 (2750/1750 kN) shows the high-static-capacity proportioning of this 480 mm bore. Heat the inner ring to max 120 °C for the 480 mm interference fit and support the ring face square during fitting; cocking over a keyway brinells the raceway before first rotation.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g N1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 480 mm inner ring.",
      "The N rib arrangement is not interchangeable with another prefix on the same 480 mm seat: inner ring ribbed, outer ring ribless. Swapping NU for NJ changes axial location behaviour even though the 700×100 mm envelope matches.",
      "Do not replace N1096 with a deep-groove ball bearing on rating alone: line contact gives 1750 kN radial capacity but the bearing cannot carry the thrust duty a ball bearing can and misalignment tolerance is only 3–4 arc-minutes.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1750/2750 kN pair here belongs to N1096 as printed, not to the bare size.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N1096?",
        "a": "N1096 is an NTN N single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N1096 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N1096 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N1096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n1096",
      "N1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ1096",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists NJ1096 on the 480×700 mm envelope, 100 mm wide: a line-contact radial bearing with a pressed sheet-steel cage and a grease limiting speed of 810 r/min. The leading NJ defines the rib arrangement (inner ring two ribs + one outer rib); the dimension-series digits and the two-digit bore code resolve to 480 mm, with 700 mm OD and 100 mm width from the ISO 15 general plan. The 100 mm width and 110.0 mm section put the NJ1000 series in the extra-light (10/49) section; wide 22/23 variants at the same bore change OD, width and heat generation and are not drop-in swaps. Speed ratio check: limiting 810 r/min is .84 of the 960 r/min oil value for NJ1096; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 480 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "brinelling from static overload or impact during handling",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g NJ1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NJ1096 skids at 810 r/min and fails by smearing long before L10 fatigue.",
      "Grease limiting speed 810 r/min and oil 960 r/min are different limits for NJ1096: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 480 mm inner ring.",
      "Open NJ1096 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 480 mm contact.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ1096?",
        "a": "NJ1096 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ1096 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ1096 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ1096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj1096",
      "NJ1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU1096",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NU1096 denotes a 480×700×100 mm (18.898 × 27.559 × 3.937 in) cylindrical roller bearing in the NU1000 family, a pressed sheet-steel cage. Digit by digit, NU1096 reads as NU (outer ring ribbed, inner ring ribless), ISO 15 series, and bore 480 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. The 110.0 mm radial section ((700−480)/2) frames the roller complement; capacity per millimetre of bore is about 3.6 kN/mm before application factors. The 480 mm (18.898 in) bore and 700 mm (27.559 in) OD are ISO 15 boundary values; fillet and shoulder dimensions must still come from the NTN mounting table for the 100 mm-wide ring. On NU arrangements confirm which ring is separable before heating: forcing the ribbed ring off over the roller complement damages the cage and rib faces.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "electrical pitting on VFD-driven motor shafts without grounding protection",
      "brinelling from static overload or impact during handling"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g NU1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 480 mm bore share bore but not OD/width; check the full NU1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NU rib arrangement is not interchangeable with another prefix on the same 480 mm seat: outer ring ribbed, inner ring ribless. Swapping NU for NJ changes axial location behaviour even though the 700×100 mm envelope matches.",
      "The 100 mm width and abutment faces must be square to the axis; a tilted spacer concentrates load across the roller set and shows as uneven raceway polish on the 480 mm inner ring.",
      "The 110.0 mm section at 480 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU1096?",
        "a": "NU1096 is an NTN NU single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU1096 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU1096 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU1096-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu1096",
      "NU1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP1096",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP1096",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1750,
    "static_load_kN": 2750,
    "fatigue_load_limit_kN": 197,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 960,
    "weight_g": 124000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP1096 denotes a 480×700×100 mm (18.898 × 27.559 × 3.937 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. Digit by digit, NUP1096 reads as NUP (inner ring two ribs + loose L-ring), ISO 15 series, and bore 480 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. With C 1750 kN and C0 2750 kN (C0/C ≈ 1.57) the bearing is proportioned for heavy radial load; the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The 3.6 kN-per-mm-bore figure (1750 kN over 480 mm) lets a NUP1096 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Keep the open bearing wrapped until fitting: the line-contact raceways of the 480 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 480 mm bore, oil-lubricated arrangements toward 960 r/min need positive flow and drain design; the 124000 g NUP1096 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 480 mm bore share bore but not OD/width; check the full NUP1000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "Grease limiting speed 810 r/min and oil 960 r/min are different limits for NUP1096: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Never press either ring through the roller complement when fitting: mounting force goes through the ring faces, or the 700 mm race brinells and releases as vibration within hours.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded NUP1096 skids at 810 r/min and fails by smearing long before L10 fatigue.",
      "The 1750/2750 kN ratings, 197 kN Pu and 124000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP1096 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP1096?",
        "a": "NUP1096 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 100 mm width (18.898 × 27.559 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 2750 kN, Pu 197 kN, grease limiting speed 810 r/min, oil 960 r/min, mass about 124000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP1096 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP1096 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP1096 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP1096?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 536 mm, Ew 644 mm. The nominal bore/OD remain 480/700 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 810 r/min grease / 960 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP1096",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup1096",
      "NUP1096"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NNU49-500K",
    "brand": "NTN",
    "manufacturer_designation": "NTN NNU49/500K",
    "series": "NNU50000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2670,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 455,
    "limiting_speed_rpm": 730,
    "max_rpm": 730,
    "speed_oil_rpm": 860,
    "weight_g": 155000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NNU49/500K is an NTN NNU cylindrical roller bearing: two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially, inside the 500×670×170 mm ISO 15 envelope. Numbering ties NNU49/500K to its envelope: type code NNU, series NNU50000, 500 mm bore; the 670×170 mm outline therefore swaps dimensionally with other ISO 15 bearings of the same code, though rib arrangements differ by prefix. Line contact between rollers and raceways gives NNU49/500K high radial capacity but no tolerance for misalignment: beyond roughly 3–4 arc-minutes the roller ends edge-load and fatigue accelerates. Thermal planning around the 730 r/min grease ceiling should include the cage type (a machined or stamped steel cage per the precision execution) and oil-flow option to 860 r/min for continuously high-duty 500 mm positions. Housing and shaft fillets must clear the ring chamfers of NNU49/500K; an oversized radius locks the ring on its face and tilts the 170 mm-wide seat.",
    "applications": [
      "precision gearbox and indexing-drive shafts",
      "high-rpm motorised grinding and milling spindles",
      "CNC lathe and machining-centre spindle radial sets",
      "precision rotary-table and dividing-head bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "hard-particle indentation of raceways in unfiltered oil or open arrangements"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 860 r/min need positive flow and drain design; the 155000 g NNU49/500K ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Wide (22/23) and light (10/49) executions at 500 mm bore share bore but not OD/width; check the full NNU50000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 500 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 670×170 mm envelope matches.",
      "The NNU rib arrangement is not interchangeable with another prefix on the same 500 mm seat: double row, ribbed outer ring, separable inner. Swapping NU for NJ changes axial location behaviour even though the 670×170 mm envelope matches.",
      "Wide (22/23) and light (10/49) executions at 500 mm bore share bore but not OD/width; check the full NNU50000 series code before substituting, because housing and shoulder geometry will not interchange.",
      "The 2670/6400 kN ratings, 455 kN Pu and 155000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NNU49/500K (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NNU49/500K?",
        "a": "NNU49/500K is an NTN NNU double-row precision cylindrical roller bearing to ISO 15: 500 mm bore, 670 mm OD and 170 mm width (19.685 × 26.378 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2670 kN, C0 6400 kN, Pu 455 kN, grease limiting speed 730 r/min, oil 860 r/min, mass about 155000 g. It is open, with a machined or stamped steel cage per the precision execution."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "NN and NNU are double-row precision designs rather than single-row rib variants: NN has a ribbed inner ring and separable outer ring, NNU the reverse; both give high radial stiffness for spindles and are commonly ordered with P5/P4 precision and a K 1:12 tapered bore for preload setting. NNU49/500K is the NNU execution."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NNU49/500K is supplied in the standard open execution shown in the table."
      },
      {
        "q": "What does the K tapered bore mean on a precision NNU bearing like NNU49/500K?",
        "a": "The K suffix denotes a 1:12 tapered bore. NNU49/500K mounts on a tapered shaft seat or adapter sleeve and is driven up to a measured residual clearance or preload — this is how precision spindle bearings achieve stiffness without locknut guesswork; the cylindrical-bore NNU49/500 execution of the same envelope mounts on a plain seat."
      },
      {
        "q": "What do Fw and Ew mean for NNU49/500K?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm. The nominal bore/OD remain 500/670 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 730 r/min grease / 860 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NNU49",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=160",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nnu49-500k",
      "NNU49-500K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "N10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN N10/500",
    "series": "N1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "N10/500 is the extra-light (10/49) section of the NTN N1000 dimension series for a 500 mm shaft — 1790 kN of basic dynamic capacity in a 128000 g, open bearing. Reading the code: N for the separable-outer-ring type, then the ISO 15 diameter/width series and the bore code — ×5 = 500 mm (00–03 use the 10/12/15/17 exception table); slash sizes like this one print the bore directly after the slash. With C 1790 kN and C0 2870 kN (C0/C ≈ 1.60) the bearing is proportioned for heavy radial load; the N design is non-locating like NU but floats with the separable outer ring in the housing. Speed ratio check: limiting 770 r/min is .85 of the 910 r/min oil value for N10/500; grease-churn heating closes that gap as fill quantity rises. Keep the open bearing wrapped until fitting: the line-contact raceways of the 500 mm bore indent under a single hard particle, and the steel cage provides no sealing of its own.",
    "applications": [
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g N10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for N10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Open N10/500 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 500 mm contact.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for N10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Minimum radial load is frequently missed in oversized motor and fan selections: an underloaded N10/500 skids at 770 r/min and fails by smearing long before L10 fatigue.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for N10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of N10/500?",
        "a": "N10/500 is an NTN N single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. N10/500 is two integral ribs on the inner ring and a ribless separable outer ring — equivalent float behaviour with the separable ring on the housing side."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. N10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can N10/500 take axial load and locate a shaft?",
        "a": "the N design is non-locating like NU but floats with the separable outer ring in the housing. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for N10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "N10",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "n10-500",
      "N10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NJ10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN NJ10/500",
    "series": "NJ1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, NJ10/500 appears as a 500 mm bore single-row cylindrical roller bearing (1790 kN C / 2870 kN C0) with a pressed sheet-steel cage, listed to the ISO 15 boundary plan. Digit by digit, NJ10/500 reads as NJ (inner ring two ribs + one outer rib), ISO 15 series, and bore 500 mm; trailing letters such as EA or E mark the cage/capacity execution and are part of the order number. NTN prints the raceway diameters for this size — Fw 556 mm and Ew 664 mm — the envelope inside the 500/720 mm bore/OD where the rollers actually run. Mass 128000 g for the 500×720×100 mm NJ10/500 execution covers the pressed-steel cage and full roller complement; substitute on mass plus rating, not envelope alone. After mounting verify the outer ring slides axially by hand at ambient temperature; a stuck float ring in a NJ10/500 non-locating position preloads the bearing when the shaft grows.",
    "applications": [
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts",
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts"
    ],
    "failure_modes": [
      "inner-ring raceway spalling from overload in the line-contact Hertzian zone",
      "cage wear accelerated when the EA high-capacity roller complement runs continuously above its thermal balance",
      "roller-end and raceway scoring from inadequate oil flow under heavy radial load",
      "brinelling from static overload or impact during handling",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g NJ10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 500 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 720×100 mm envelope matches.",
      "The 110.0 mm section at 500 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The 110.0 mm section at 500 mm bore leaves a narrow oil path; with the standard cage the relubrication groove and oil-level design must keep grease from churning in the 100 mm-wide cavity.",
      "The NJ rib arrangement is not interchangeable with another prefix on the same 500 mm seat: inner ring two ribs + one outer rib. Swapping NU for NJ changes axial location behaviour even though the 720×100 mm envelope matches.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NJ10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NJ10/500?",
        "a": "NJ10/500 is an NTN NJ single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NJ10/500 is two integral ribs on the inner ring and one rib on the outer ring — it locates the shaft in one axial direction."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NJ10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NJ10/500 take axial load and locate a shaft?",
        "a": "the NJ design accepts axial load in one direction and provides one-way shaft location. For two-direction location use an NUP execution or an NJ pair with loose rib rings."
      },
      {
        "q": "What do Fw and Ew mean for NJ10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NJ10",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nj10-500",
      "NJ10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NU10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN NU10/500",
    "series": "NU1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For pure radial duty on a 500 mm shaft NTN supplies NU10/500: two integral ribs on the outer ring and a ribless, separable inner ring; the open execution is rated 770 r/min on grease and 910 r/min on oil. On the NTN nameplate NU states which ring carries the ribs, which determines whether NU10/500 floats or locates; the numeric remainder is the ISO 15 series and 500 mm bore reference, not a fit or clearance instruction. The separable ring comes off without removing the roller assembly from the other ring, which eases inspection and lets the non-locating arrangement accommodate thermal shaft growth — the NU design floats on both sides. Speed ratio check: limiting 770 r/min is .85 of the 910 r/min oil value for NU10/500; grease-churn heating closes that gap as fill quantity rises. Mount the separable inner ring + roller assembly on the shaft first and slide the outer ring into the housing; never press the outer ring through the rollers of NU10/500.",
    "applications": [
      "large turbine and generator rotor bearings",
      "wind-turbine gearbox planet and rotor shafts",
      "ship propulsion line shafts and reduction gears",
      "mining SAG/ball-mill drive shafts"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "cage distortion after a mounting blow carried through the roller set",
      "grease starvation and cage drag when relubrication intervals are extended past the grease life",
      "edge loading from shaft deflection beyond the 3–4 arc-minute alignment limit",
      "rolling-contact fatigue after the catalogue L10 life is exceeded"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g NU10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for NU10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "Grease limiting speed 770 r/min and oil 910 r/min are different limits for NU10/500: the first is the cage/lubricant mechanical ceiling, the second assumes real oil flow rather than an oil bath.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1790/2870 kN pair here belongs to NU10/500 as printed, not to the bare size.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1790/2870 kN pair here belongs to NU10/500 as printed, not to the bare size.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NU10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NU10/500?",
        "a": "NU10/500 is an NTN NU single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NU10/500 is two integral ribs on the outer ring and a ribless, separable inner ring — a non-locating bearing that lets the shaft float axially."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NU10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NU10/500 take axial load and locate a shaft?",
        "a": "the NU design carries no axial load and floats axially on both sides. Provide axial location with an adjacent locating bearing (angular-contact, deep-groove or a paired NJ/NUP set)."
      },
      {
        "q": "What do Fw and Ew mean for NU10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NU10-500-MA",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "NU10-530-MA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-560-MA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-600-MA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-710-ECMA",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      },
      {
        "equiv_sku": "NU10-750-ECMA-HB1",
        "equiv_brand": "SKF",
        "level": "verify",
        "note": "Model-number interchange per ISO 15; confirm dimensions, sealing and ratings in the supplier catalogue."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nu10-500",
      "NU10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "NUP10-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN NUP10/500",
    "series": "NUP1000-series",
    "type": "cylindrical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 1790,
    "static_load_kN": 2870,
    "fatigue_load_limit_kN": 203,
    "limiting_speed_rpm": 770,
    "max_rpm": 770,
    "speed_oil_rpm": 910,
    "weight_g": 128000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number NUP10/500 denotes a 500×720×100 mm (19.685 × 28.346 × 3.937 in) cylindrical roller bearing in the NUP1000 family, a pressed sheet-steel cage. The leading NUP defines the rib arrangement (inner ring two ribs + loose L-ring); the dimension-series digits and the two-digit bore code resolve to 500 mm, with 720 mm OD and 100 mm width from the ISO 15 general plan. NTN prints two speed ceilings: 770 r/min grease and 910 r/min oil — the pressed-steel cage and lubricant film set the real limit at the 500 mm bore. The 3.6 kN-per-mm-bore figure (1790 kN over 500 mm) lets a NUP10/500 interchange candidate be screened quickly against the same-envelope ball or roller alternatives. Confirm the loose L-shaped rib ring is fitted and seated, since it is what turns the NJ-type arrangement into the two-direction-locating NUP set on the 500 mm shaft.",
    "applications": [
      "offshore drawworks and winch drums",
      "heavy press and large gearbox main shafts",
      "rolling-mill work-roll and backup-roll positions",
      "large turbine and generator rotor bearings"
    ],
    "failure_modes": [
      "roller smearing (microwelding) at start-up before the oil film builds under insufficient radial load",
      "pressed-steel cage pocket wear when rollers skid at light load or too-thin lubricant",
      "micro-pitting when the EHL film falls below the composite roughness at high specific load",
      "brinelling from static overload or impact during handling",
      "electrical pitting on VFD-driven motor shafts without grounding protection"
    ],
    "pitfalls": [
      "At 500 mm bore, oil-lubricated arrangements toward 910 r/min need positive flow and drain design; the 128000 g NUP10/500 ring stores enough heat that grease-only duty needs a careful relubrication calculation.",
      "Open NUP10/500 units need application-supplied sealing and a defined lubricant schedule; film thickness is the first failure mode for line contact when viscosity drops at the 500 mm contact.",
      "The EA high-capacity roller complement changes the load figure versus the basic execution of the same number; the 1790/2870 kN pair here belongs to NUP10/500 as printed, not to the bare size.",
      "The NUP rib arrangement is not interchangeable with another prefix on the same 500 mm seat: inner ring two ribs + loose L-ring. Swapping NU for NJ changes axial location behaviour even though the 720×100 mm envelope matches.",
      "If the shaft must be located both ways, do not use NUP10/500 alone: pair it with a locating bearing or specify the NUP execution with the matching loose rib ring from the 2203E table.",
      "The 1790/2870 kN ratings, 203 kN Pu and 128000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for NUP10/500 (standard execution); other makes sharing the ISO 15 envelope revise internal geometry without changing the order number, so keep the 2203E reference with the specification for critical drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of NUP10/500?",
        "a": "NUP10/500 is an NTN NUP single-row cylindrical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 100 mm width (19.685 × 28.346 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1790 kN, C0 2870 kN, Pu 203 kN, grease limiting speed 770 r/min, oil 910 r/min, mass about 128000 g. It is open, with a pressed sheet-steel cage."
      },
      {
        "q": "What is the difference between NU, NJ, NUP, N and NF cylindrical roller bearings?",
        "a": "The prefix states the rib arrangement: NU has two outer-ring ribs and a ribless inner ring (float, no axial load); NJ adds ribs for one-direction location; NUP adds a loose L-ring to locate both directions; N has two inner-ring ribs and a separable outer ring; NF has one rib per ring for one-direction guidance. NUP10/500 is the NJ rib arrangement plus a loose L-shaped rib ring on the inner ring — it locates the shaft in both axial directions."
      },
      {
        "q": "What do the EA, E and ＊ suffixes mean on NTN cylindrical roller bearings?",
        "a": "EA is NTN's high-capacity design with a pressed sheet-steel cage and optimised roller complement in the same ISO 15 envelope; E marks the high-capacity design at the larger bores; the ＊ symbol printed before the code in the NTN catalogue marks the ULTAGE new-generation specification and is not typed as part of the order number. NUP10/500 is supplied in the standard open execution shown in the table."
      },
      {
        "q": "Can NUP10/500 take axial load and locate a shaft?",
        "a": "the NUP design provides two-direction axial location via its loose rib ring, for light/moderate thrust guidance. The loose rib ring still only suits light/short-duration axial guidance; heavy thrust belongs to a dedicated thrust bearing."
      },
      {
        "q": "What do Fw and Ew mean for NUP10/500?",
        "a": "Fw is the inner sub-assembly raceway/roller-set envelope diameter and Ew the outer-ring raceway diameter printed for geometric checks: Fw 556 mm, Ew 664 mm. The nominal bore/OD remain 500/720 mm; Fw/Ew describe the rolling-contact path, and speeds still run to 770 r/min grease / 910 r/min oil."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "NUP10",
        "equiv_brand": "ISO 15",
        "level": "full",
        "note": "ISO 15 boundary-dimension envelope; standard interchange — confirm clearance class and precision with the supplier."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=155",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "nup10-500",
      "NUP10-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EAKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EAKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 169,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22205EAKW33 with a 1:12 tapered bore (K) and W33 annular lubrication groove with outer-ring holes: 25 mm bore, 52 mm OD, 18 mm width, rated 10,400 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 25 mm bore; the 18 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 57.3 kN C and 169 g mass the 22200 series part is built for shock and vibration; the 18 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 22205EAKW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22205EAKW33 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 52 mm race.",
    "applications": [
      "light conveyor pulleys and drum shafts",
      "small agricultural and forestry machinery",
      "medium fan and blower shafts with belt pull",
      "small reducer and gearbox output shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "Never substitute 22205EAKW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22205EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 13,000 r/min needs drain and level design; flooding the 18 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 10,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 169 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EAKW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EAKW33?",
        "a": "22205EAKW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 169 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22205EAKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22205EAW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EAKW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EAKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EAKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EAKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EAW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22205EAW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205eakw33",
      "＊22205eakw33",
      "22205EAKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EAW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EAW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 173,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22205EAW33 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 25 mm shaft — 57.3 kN basic dynamic capacity in a 173 g, open ISO 15 envelope. Numbering ties 22205EAW33 to its envelope and execution: same-number EA versus EM or plain variants share the 25 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22205EAW33 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22205EAW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "medium fan and blower shafts with belt pull",
      "small reducer and gearbox output shafts",
      "construction-mixer and small crusher shafts",
      "textile and paper converting rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 18 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22205EAW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 18 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 57.3 kN rating no longer applies.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 173 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EAW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EAW33?",
        "a": "22205EAW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 173 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22205EAW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22205EAKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EAW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EAW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EAW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EAW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EAKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22205EAKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205eaw33",
      "＊22205eaw33",
      "22205EAW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EMKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EMKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 171,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 25 mm shaft, NTN supplies 22205EMKW33: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 13,000 r/min. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 25 mm (two-digit code ×5, with the 00–03 exception table), and 52 mm OD / 18 mm width follow the general plan. Open by design, 22205EMKW33 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. The 13.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 18 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "textile and paper converting rolls",
      "small vibrating-screen and shaker shafts",
      "light conveyor pulleys and drum shafts",
      "small agricultural and forestry machinery"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 25 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22205EMKW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 18 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 57.3 kN rating no longer applies.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 171 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EMKW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EMKW33?",
        "a": "22205EMKW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 171 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22205EMKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22205EMW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EMKW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EMKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EMKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EMKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EMW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22205EMW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205emkw33",
      "＊22205emkw33",
      "22205EMKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22205EMW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22205EMW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 25,
    "D_mm": 52,
    "B_mm": 18,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 57.3,
    "static_load_kN": 46.1,
    "fatigue_load_limit_kN": 3.23,
    "limiting_speed_rpm": 10400,
    "max_rpm": 10400,
    "speed_oil_rpm": 13000,
    "weight_g": 174,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22205EMW33 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 25×52×18 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 25×52 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and W33 annular lubrication groove with outer-ring holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. The 13.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 18 mm-wide ring seats fully on both sides. Never mount 22205EMW33 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 52 mm race.",
    "applications": [
      "small agricultural and forestry machinery",
      "medium fan and blower shafts with belt pull",
      "small reducer and gearbox output shafts",
      "construction-mixer and small crusher shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 25 mm bore the two-row set is sensitive to over-greasing: pack only the calculated volume around the W33 feature or churning heat cancels the 10,400 r/min speed rating.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22205EMW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 25 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22205EMW33 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 25×52 mm envelope is identical.",
      "Never substitute 22205EMW33 by envelope alone: the 46.1 kN C0 and 3.23 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 57.3/46.1 kN ratings, 3.23 kN Pu and 174 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22205EMW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22205EMW33?",
        "a": "22205EMW33 is an NTN double-row spherical roller bearing to ISO 15: 25 mm bore, 52 mm OD and 18 mm width (0.984 × 2.047 × 0.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 57.3 kN, C0 46.1 kN, Pu 3.23 kN, grease limiting speed 10,400 r/min, oil 13,000 r/min, mass about 174 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22205EMW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22205EMKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22205EMW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22205EMW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22205EMW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22205EMW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 57.3 kN C / 46.1 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22205EMKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22205EMKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22205emw33",
      "＊22205emw33",
      "22205EMW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EAKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EAKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 272,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22206EAKW33 denotes the 30 mm bore spherical roller bearing (75.7 kN C / 64.5 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (W33); 22206EAKW33 is assembled exactly in that order. NTN prints two speeds for 22206EAKW33: 8,800 r/min grease and 11,000 r/min oil — the gap of 2,200 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 0.85 (64.5/75.7 kN) reflects the heavy static and shock proportioning of 22206EAKW33; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 20 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EAKW33 is greased for life.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22206EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 30 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22206EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 11,000 r/min needs drain and level design; flooding the 20 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 272 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EAKW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EAKW33?",
        "a": "22206EAKW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 272 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22206EAKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22206EAW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EAKW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EAKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EAKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EAKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EAW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22206EAW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206eakw33",
      "＊22206eakw33",
      "22206EAKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EAW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EAW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 278,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22206EAW33 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 30 mm shaft — 75.7 kN basic dynamic capacity in a 278 g, open ISO 15 envelope. Reading the full code: the number gives the 30×62 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and W33 annular lubrication groove with outer-ring holes completes the order number. The W33 annular lubrication groove with outer-ring holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22206EAW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22206EAW33 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EAW33 is greased for life.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 30 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 8,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22206EAW33 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 30×62 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 30 mm bearing, and drive-up procedures differ.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 278 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EAW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EAW33?",
        "a": "22206EAW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 278 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22206EAW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22206EAKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EAW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EAW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EAW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EAW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EAKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22206EAKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206eaw33",
      "＊22206eaw33",
      "22206EAW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EMKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EMKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 275,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22206EMKW33 is the EM machined-brass-cage execution of NTN's spherical roller range for a 30 mm shaft — 75.7 kN basic dynamic capacity in a 275 g, open ISO 15 envelope. Reading the full code: the number gives the 30×62 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and W33 annular lubrication groove with outer-ring holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 8,800 r/min grease limiting speed is the cage/kinematic ceiling and 11,000 r/min is the oil-lubricated value for the 30 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22206EMKW33 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EMKW33 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 75.7 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a W33 22206EMKW33 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22206EMKW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22206EMKW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 275 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EMKW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EMKW33?",
        "a": "22206EMKW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 275 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22206EMKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22206EMW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EMKW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EMKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EMKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EMKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EMW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22206EMW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206emkw33",
      "＊22206emkw33",
      "22206EMKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22206EMW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22206EMW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 30,
    "D_mm": 62,
    "B_mm": 20,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 75.7,
    "static_load_kN": 64.5,
    "fatigue_load_limit_kN": 4.58,
    "limiting_speed_rpm": 8800,
    "max_rpm": 8800,
    "speed_oil_rpm": 11000,
    "weight_g": 281,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22206EMW33 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 30×62×20 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 22206EMW33 to its envelope and execution: same-number EA versus EM or plain variants share the 30 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22206EMW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22206EMW33 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 30 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22206EMW33 is greased for life.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 30 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 11,000 r/min needs drain and level design; flooding the 20 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22206EMW33 by envelope alone: the 64.5 kN C0 and 4.58 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22206EMW33 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 75.7/64.5 kN ratings, 4.58 kN Pu and 281 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22206EMW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22206EMW33?",
        "a": "22206EMW33 is an NTN double-row spherical roller bearing to ISO 15: 30 mm bore, 62 mm OD and 20 mm width (1.181 × 2.441 × 0.787 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 75.7 kN, C0 64.5 kN, Pu 4.58 kN, grease limiting speed 8,800 r/min, oil 11,000 r/min, mass about 281 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22206EMW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22206EMKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22206EMW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22206EMW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22206EMW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22206EMW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 75.7 kN C / 64.5 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22206EMKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22206EMKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22206emw33",
      "＊22206emw33",
      "22206EMW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EAKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EAKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22207EAKW33 with a 1:12 tapered bore (K) and W33 annular lubrication groove with outer-ring holes: 35 mm bore, 72 mm OD, 23 mm width, rated 7,500 r/min on grease. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 35 mm (two-digit code ×5, with the 00–03 exception table), and 72 mm OD / 23 mm width follow the general plan. Suffix reading on 22207EAKW33: EA identifies the high-capacity execution with a pressed sheet-steel window cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and W33 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 6.11 kN against C0 92 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22207EAKW33 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 23 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EAKW33 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 7,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22207EAW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 22207EAKW33 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 35×72 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 100/92 kN ratings, 6.11 kN Pu and 430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EAKW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EAKW33?",
        "a": "22207EAKW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 430 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22207EAKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22207EAW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EAKW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EAKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EAKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EAKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EAW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22207EAW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207eakw33",
      "＊22207eakw33",
      "22207EAKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EAW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EAW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 438,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22207EAW33 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 35 mm shaft — 100 kN basic dynamic capacity in a 438 g, open ISO 15 envelope. Numbering ties 22207EAW33 to its envelope and execution: same-number EA versus EM or plain variants share the 35 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 18.5 mm radial section over the 35 mm bore carries two roller rows; capacity per millimetre of bore is about 2.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 35 mm bore is 1.378 in and 72 mm OD is 2.835 in; the ISO 15 envelope swaps between brands, but the 100/92 kN ratings and cage design are NTN 2203E values. Never mount 22207EAW33 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 72 mm race.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EAW33 is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a W33 22207EAW33 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 7,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22207EAW33 and its tapered-bore counterpart 22207EAKW33 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 100/92 kN ratings, 6.11 kN Pu and 438 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EAW33 (EA pressed-steel-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EAW33?",
        "a": "22207EAW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 438 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22207EAW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22207EAKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EAW33 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EAW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EAW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EAW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EAKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22207EAKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207eaw33",
      "＊22207eaw33",
      "22207EAW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EMKW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EMKW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 433,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 35 mm shaft, NTN supplies 22207EMKW33: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 9,400 r/min. Numbering ties 22207EMKW33 to its envelope and execution: same-number EA versus EM or plain variants share the 35 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 18.5 mm radial section over the 35 mm bore carries two roller rows; capacity per millimetre of bore is about 2.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 6.11 kN against C0 92 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22207EMKW33 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 23 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EMKW33 is greased for life.",
      "Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22207EMKW33 by envelope alone: the 92 kN C0 and 6.11 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22207EMW33: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 100/92 kN ratings, 6.11 kN Pu and 433 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EMKW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EMKW33?",
        "a": "22207EMKW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 433 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22207EMKW33 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22207EMW33."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EMKW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EMKW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EMKW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EMKW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EMW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22207EMW33 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207emkw33",
      "＊22207emkw33",
      "22207EMKW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22207EMW33",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22207EMW33",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 35,
    "D_mm": 72,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 100,
    "static_load_kN": 92,
    "fatigue_load_limit_kN": 6.11,
    "limiting_speed_rpm": 7500,
    "max_rpm": 7500,
    "speed_oil_rpm": 9400,
    "weight_g": 442,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22207EMW33 identifies a 35×72×23 mm (1.378 × 2.835 × 0.906 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 35×72 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and W33 annular lubrication groove with outer-ring holes completes the order number. The W33 annular lubrication groove with outer-ring holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22207EMW33; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 23 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 35 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22207EMW33 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 100 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 9,400 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 35 mm bearing, and drive-up procedures differ.",
      "The 100/92 kN ratings, 6.11 kN Pu and 442 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22207EMW33 (EM machined-brass-cage/W33); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22207EMW33?",
        "a": "22207EMW33 is an NTN double-row spherical roller bearing to ISO 15: 35 mm bore, 72 mm OD and 23 mm width (1.378 × 2.835 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 100 kN, C0 92 kN, Pu 6.11 kN, grease limiting speed 7,500 r/min, oil 9,400 r/min, mass about 442 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22207EMW33 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22207EMKW33 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22207EMW33 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22207EMW33?",
        "a": "W33 denotes the annular lubrication groove with holes in the outer ring: the housing grease port feeds the groove and both roller rows directly. On NTN executions the same feature is spelled D1 in the NTN suffix language; 22207EMW33 carries W33."
      },
      {
        "q": "How much misalignment and axial load can 22207EMW33 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 100 kN C / 92 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22207EMKW33",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22207EMKW33 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22207emw33",
      "＊22207emw33",
      "22207EMW33"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 116,
    "static_load_kN": 105,
    "fatigue_load_limit_kN": 7.78,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 528,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 40×80×23 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22208EAD1 is assembled exactly in that order. Pu 7.78 kN is the catalogue fatigue load limit for 22208EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 528 g (0.53 kg) for the 40×80×23 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 22208EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EAD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22208EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 8,500 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 116/105 kN ratings, 7.78 kN Pu and 528 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EAD1?",
        "a": "22208EAD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 105 kN, Pu 7.78 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 528 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22208EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22208EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 105 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22208EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208ead1",
      "＊22208ead1",
      "22208EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 116,
    "static_load_kN": 105,
    "fatigue_load_limit_kN": 7.78,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 518,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 40 mm shaft — 116 kN basic dynamic capacity in a 518 g, open ISO 15 envelope. Reading the full code: the number gives the 40×80 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 7.78 kN is the catalogue fatigue load limit for 22208EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22208EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EAKD1 is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 116 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 116/105 kN ratings, 7.78 kN Pu and 518 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EAKD1?",
        "a": "22208EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 105 kN, Pu 7.78 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 518 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22208EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22208EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 105 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22208EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208eakd1",
      "＊22208eakd1",
      "22208EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 110,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 7.29,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 529,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22208EMD1 identifies a 40×80×23 mm (1.575 × 3.15 × 0.906 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 22208EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 40 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 7.29 kN is the catalogue fatigue load limit for 22208EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 2.8 kN of C per millimetre of the 40 mm bore, 22208EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 40 mm set.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22208EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 40×80 mm envelope is identical.",
      "Never substitute 22208EMD1 by envelope alone: the 98 kN C0 and 7.29 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22208EMD1 by envelope alone: the 98 kN C0 and 7.29 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22208EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 110/98 kN ratings, 7.29 kN Pu and 529 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EMD1?",
        "a": "22208EMD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 98 kN, Pu 7.29 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 529 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22208EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22208EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 110 kN C / 98 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22208EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208emd1",
      "＊22208emd1",
      "22208EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22208EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22208EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 80,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 110,
    "static_load_kN": 98,
    "fatigue_load_limit_kN": 7.29,
    "limiting_speed_rpm": 6800,
    "max_rpm": 6800,
    "speed_oil_rpm": 8500,
    "weight_g": 519,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22208EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 40×80×23 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 22208EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 40 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 110 kN, C0 98 kN (C0/C ≈ 0.89), with useful axial capacity in either direction alongside the dominant radial load. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22208EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22208EMKD1 is greased for life.",
      "Oil relubrication toward 8,500 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22208EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22208EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 40 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 110/98 kN ratings, 7.29 kN Pu and 519 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22208EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22208EMKD1?",
        "a": "22208EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 80 mm OD and 23 mm width (1.575 × 3.15 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 110 kN, C0 98 kN, Pu 7.29 kN, grease limiting speed 6,800 r/min, oil 8,500 r/min, mass about 519 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22208EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22208EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22208EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22208EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22208EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22208EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 110 kN C / 98 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22208EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22208EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22208emkd1",
      "＊22208emkd1",
      "22208EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21308C",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21308C",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 4900,
    "max_rpm": 4900,
    "speed_oil_rpm": 6400,
    "weight_g": 705,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21308C is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 40×90×23 mm to ISO 15, with pressed-steel cage of the 213-series C design. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (cylindrical), lubrication feature (none); 21308C is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the C design-code cage. Pu 12.6 kN against C0 90 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21308C moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21308C is greased for life.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21308C in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 40 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 98 kN rating no longer applies.",
      "Never substitute 21308C by envelope alone: the 90 kN C0 and 12.6 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The 98/90 kN ratings, 12.6 kN Pu and 705 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21308C (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21308C?",
        "a": "21308C is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 90 kN, Pu 12.6 kN, grease limiting speed 4,900 r/min, oil 6,400 r/min, mass about 705 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21308C has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21308CK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21308C is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21308C?",
        "a": "21308C is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21308C take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 98 kN C / 90 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21308CK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21308CK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21308c",
      "21308C"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21308CK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21308CK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 98,
    "static_load_kN": 90,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 4900,
    "max_rpm": 4900,
    "speed_oil_rpm": 6400,
    "weight_g": 694,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21308CK is the C design-code execution of NTN's spherical roller range for a 40 mm shaft — 98 kN basic dynamic capacity in a 694 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 40 mm (two-digit code ×5, with the 00–03 exception table), and 90 mm OD / 23 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 694 g (0.69 kg) for the 40×90×23 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21308CK is greased for life.",
      "Never substitute 21308CK by envelope alone: the 90 kN C0 and 12.6 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21308CK in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21308CK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 98/90 kN ratings, 12.6 kN Pu and 694 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21308CK (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21308CK?",
        "a": "21308CK is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 23 mm width (1.575 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 98 kN, C0 90 kN, Pu 12.6 kN, grease limiting speed 4,900 r/min, oil 6,400 r/min, mass about 694 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21308CK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21308C."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21308CK is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21308CK?",
        "a": "21308CK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21308CK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 98 kN C / 90 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21308C",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21308C — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21308ck",
      "21308CK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22308EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 40 mm (two-digit code ×5, with the 00–03 exception table), and 90 mm OD / 33 mm width follow the general plan. Suffix reading on 22308EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 40 mm bore is 1.575 in and 90 mm OD is 3.543 in; the ISO 15 envelope swaps between brands, but the 169/152 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 40 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EAD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22308EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 40×90 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22308EAD1 and its tapered-bore counterpart 22308EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EAD1?",
        "a": "22308EAD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1020 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22308EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22308EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22308EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308ead1",
      "＊22308ead1",
      "22308EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22308EAKD1 identifies a 40×90×33 mm (1.575 × 3.543 × 1.299 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22308EAKD1 is assembled exactly in that order. Open by design, 22308EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 5,400 r/min limiting value is .82 of the 6,600 r/min oil value; heavy 33 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 40 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EAKD1 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 169 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22308EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 169 kN rating no longer applies.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EAKD1?",
        "a": "22308EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1000 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22308EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22308EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22308EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308eakd1",
      "＊22308eakd1",
      "22308EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1030,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22308EMD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 40 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 169 kN C and 1030 g mass the 22300 series part is built for shock and vibration; the 33 mm-wide ring needs square abutments to keep both rows equally loaded. 40 mm bore is 1.575 in and 90 mm OD is 3.543 in; the ISO 15 envelope swaps between brands, but the 169/152 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22308EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EMD1 is greased for life.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EMD1?",
        "a": "22308EMD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1030 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22308EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22308EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22308EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308emd1",
      "＊22308emd1",
      "22308EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22308EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22308EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 40,
    "D_mm": 90,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 169,
    "static_load_kN": 152,
    "fatigue_load_limit_kN": 9.36,
    "limiting_speed_rpm": 5400,
    "max_rpm": 5400,
    "speed_oil_rpm": 6600,
    "weight_g": 1010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22308EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 40 mm bore, 90 mm OD, 33 mm width, rated 5,400 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 40 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 22308EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 40 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22308EMKD1 is greased for life.",
      "Never substitute 22308EMKD1 by envelope alone: the 152 kN C0 and 9.36 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 169 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22308EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 22308EMKD1 by envelope alone: the 152 kN C0 and 9.36 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 169/152 kN ratings, 9.36 kN Pu and 1010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22308EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22308EMKD1?",
        "a": "22308EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 40 mm bore, 90 mm OD and 33 mm width (1.575 × 3.543 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 169 kN, C0 152 kN, Pu 9.36 kN, grease limiting speed 5,400 r/min, oil 6,600 r/min, mass about 1010 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22308EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22308EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22308EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22308EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22308EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22308EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 169 kN C / 152 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22308EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22308EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22308emkd1",
      "＊22308emkd1",
      "22308EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 121,
    "static_load_kN": 113,
    "fatigue_load_limit_kN": 8.76,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 572,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22209EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 45 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 121 kN C and 572 g mass the 22200 series part is built for shock and vibration; the 23 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 8.76 kN against C0 113 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22209EAD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 45 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EAD1 is greased for life.",
      "The cylindrical-bore 22209EAD1 and its tapered-bore counterpart 22209EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 121/113 kN ratings, 8.76 kN Pu and 572 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EAD1?",
        "a": "22209EAD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 121 kN, C0 113 kN, Pu 8.76 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 572 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22209EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22209EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 121 kN C / 113 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22209EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209ead1",
      "＊22209ead1",
      "22209EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 121,
    "static_load_kN": 113,
    "fatigue_load_limit_kN": 8.76,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 561,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 45 mm shaft — 121 kN basic dynamic capacity in a 561 g, open ISO 15 envelope. Numbering ties 22209EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 45 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 121 kN C and 561 g mass the 22200 series part is built for shock and vibration; the 23 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 22209EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EAKD1 is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 121 kN rating no longer applies.",
      "Never substitute 22209EAKD1 by envelope alone: the 113 kN C0 and 8.76 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22209EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 121/113 kN ratings, 8.76 kN Pu and 561 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EAKD1?",
        "a": "22209EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 121 kN, C0 113 kN, Pu 8.76 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 561 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22209EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22209EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 121 kN C / 113 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22209EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209eakd1",
      "＊22209eakd1",
      "22209EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 116,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 8.24,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 577,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EMD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 45 mm (two-digit code ×5, with the 00–03 exception table), and 85 mm OD / 23 mm width follow the general plan. NTN prints two speeds for 22209EMD1: 6,100 r/min grease and 7,700 r/min oil — the gap of 1,600 r/min reflects oil cooling of the heavy roller set. Catalogue mass 577 g (0.58 kg) for the 45×85×23 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 45 mm set.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EMD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 6,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22209EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 7,700 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 116/106 kN ratings, 8.24 kN Pu and 577 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EMD1?",
        "a": "22209EMD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 106 kN, Pu 8.24 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 577 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22209EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22209EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22209EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209emd1",
      "＊22209emd1",
      "22209EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22209EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22209EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 85,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 116,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 8.24,
    "limiting_speed_rpm": 6100,
    "max_rpm": 6100,
    "speed_oil_rpm": 7700,
    "weight_g": 566,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22209EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 45×85×23 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 45×85 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Suffix reading on 22209EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. Never mount 22209EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 85 mm race.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22209EMKD1 is greased for life.",
      "Never substitute 22209EMKD1 by envelope alone: the 106 kN C0 and 8.24 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 45 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22209EMKD1 by envelope alone: the 106 kN C0 and 8.24 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 23 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 116/106 kN ratings, 8.24 kN Pu and 566 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22209EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22209EMKD1?",
        "a": "22209EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 85 mm OD and 23 mm width (1.772 × 3.346 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 116 kN, C0 106 kN, Pu 8.24 kN, grease limiting speed 6,100 r/min, oil 7,700 r/min, mass about 566 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22209EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22209EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22209EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22209EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22209EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22209EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 116 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22209EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22209EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22209emkd1",
      "＊22209emkd1",
      "22209EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21309C",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21309C",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 114,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 14.1,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5700,
    "weight_g": 927,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21309C is the C design-code execution of NTN's spherical roller range for a 45 mm shaft — 114 kN basic dynamic capacity in a 927 g, open ISO 15 envelope. Numbering ties 21309C to its envelope and execution: same-number EA versus EM or plain variants share the 45 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 927 g (0.93 kg) for the 45×100×25 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 25 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21309C is greased for life.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21309C on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21309C in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21309C in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21309C on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 114/106 kN ratings, 14.1 kN Pu and 927 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21309C (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21309C?",
        "a": "21309C is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 114 kN, C0 106 kN, Pu 14.1 kN, grease limiting speed 4,400 r/min, oil 5,700 r/min, mass about 927 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21309C has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21309CK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21309C is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21309C?",
        "a": "21309C is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21309C take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 114 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21309CK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21309CK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21309c",
      "21309C"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21309CK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21309CK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 114,
    "static_load_kN": 106,
    "fatigue_load_limit_kN": 14.1,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5700,
    "weight_g": 912,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21309CK identifies a 45×100×25 mm (1.772 × 3.937 × 0.984 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 45×100 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 4,400 r/min limiting value is .77 of the 5,700 r/min oil value; heavy 25 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 21309CK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 100 mm race.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21309CK is greased for life.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 114 kN rating no longer applies.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21309CK in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "The 114/106 kN ratings, 14.1 kN Pu and 912 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21309CK (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21309CK?",
        "a": "21309CK is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 25 mm width (1.772 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 114 kN, C0 106 kN, Pu 14.1 kN, grease limiting speed 4,400 r/min, oil 5,700 r/min, mass about 912 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21309CK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21309C."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21309CK is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21309CK?",
        "a": "21309CK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21309CK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 114 kN C / 106 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21309C",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21309C — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21309ck",
      "21309CK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22309EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 45×100×36 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 45 mm bore; the 36 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 11.8 kN is the catalogue fatigue load limit for 22309EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 4.6 kN of C per millimetre of the 45 mm bore, 22309EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 45 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EAD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 45 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22309EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22309EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EAD1?",
        "a": "22309EAD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1370 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22309EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22309EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22309EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309ead1",
      "＊22309ead1",
      "22309EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22309EAKD1 identifies a 45×100×36 mm (1.772 × 3.937 × 1.417 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 45 mm bore; the 36 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 4,600 r/min limiting value is .81 of the 5,700 r/min oil value; heavy 36 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 45 mm set.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EAKD1 is greased for life.",
      "Oil relubrication toward 5,700 r/min needs drain and level design; flooding the 36 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22309EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 45×100 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22309EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 45 mm bearing, and drive-up procedures differ.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1340 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EAKD1?",
        "a": "22309EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1340 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22309EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22309EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22309EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309eakd1",
      "＊22309eakd1",
      "22309EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1380,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22309EMD1 identifies a 45×100×36 mm (1.772 × 3.937 × 1.417 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 45×100 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 206 kN, C0 187 kN (C0/C ≈ 0.91), with useful axial capacity in either direction alongside the dominant radial load. With about 4.6 kN of C per millimetre of the 45 mm bore, 22309EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 22309EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 100 mm race.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22309EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 45×100 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 206 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 45 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1380 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EMD1?",
        "a": "22309EMD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1380 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22309EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22309EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22309EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309emd1",
      "＊22309emd1",
      "22309EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22309EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22309EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 45,
    "D_mm": 100,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 206,
    "static_load_kN": 187,
    "fatigue_load_limit_kN": 11.8,
    "limiting_speed_rpm": 4600,
    "max_rpm": 4600,
    "speed_oil_rpm": 5700,
    "weight_g": 1350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22309EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 45 mm bore, 100 mm OD, 36 mm width, rated 4,600 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22309EMKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 4,600 r/min limiting value is .81 of the 5,700 r/min oil value; heavy 36 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 45 mm set.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 45 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22309EMKD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22309EMKD1 by envelope alone: the 187 kN C0 and 11.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 206 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22309EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 206/187 kN ratings, 11.8 kN Pu and 1350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22309EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22309EMKD1?",
        "a": "22309EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 45 mm bore, 100 mm OD and 36 mm width (1.772 × 3.937 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 206 kN, C0 187 kN, Pu 11.8 kN, grease limiting speed 4,600 r/min, oil 5,700 r/min, mass about 1350 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22309EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22309EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22309EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22309EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22309EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22309EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 206 kN C / 187 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22309EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22309EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22309emkd1",
      "＊22309emkd1",
      "22309EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 130,
    "static_load_kN": 124,
    "fatigue_load_limit_kN": 10.1,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 614,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22210EAD1 identifies a 50×90×23 mm (1.969 × 3.543 × 0.906 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 50 mm bore; the 23 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 130 kN C and 614 g mass the 22200 series part is built for shock and vibration; the 23 mm-wide ring needs square abutments to keep both rows equally loaded. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EAD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22210EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22210EAD1 by envelope alone: the 124 kN C0 and 10.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 130/124 kN ratings, 10.1 kN Pu and 614 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EAD1?",
        "a": "22210EAD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 124 kN, Pu 10.1 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 614 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22210EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22210EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 130 kN C / 124 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22210EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210ead1",
      "＊22210ead1",
      "22210EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 130,
    "static_load_kN": 124,
    "fatigue_load_limit_kN": 10.1,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 602,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22210EAKD1 denotes the 50 mm bore spherical roller bearing (130 kN C / 124 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22210EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 50 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 130 kN, C0 124 kN (C0/C ≈ 0.95), with useful axial capacity in either direction alongside the dominant radial load. Grease/oil ratio: the 5,700 r/min limiting value is .79 of the 7,200 r/min oil value; heavy 23 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22210EAKD1 on its adapter or withdrawal sleeve on the 50 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EAKD1 is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22210EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 130 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 50 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 130/124 kN ratings, 10.1 kN Pu and 602 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EAKD1?",
        "a": "22210EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 130 kN, C0 124 kN, Pu 10.1 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 602 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22210EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22210EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 130 kN C / 124 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22210EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210eakd1",
      "＊22210eakd1",
      "22210EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 125,
    "static_load_kN": 117,
    "fatigue_load_limit_kN": 9.54,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 616,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22210EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 50 mm shaft — 125 kN basic dynamic capacity in a 616 g, open ISO 15 envelope. Reading the full code: the number gives the 50×90 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The cylindrical bore fits a machined 50 mm shaft seat directly; the same envelope in 22210EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. The 20.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 23 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 22210EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22210EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×90 mm envelope is identical.",
      "Never substitute 22210EMD1 by envelope alone: the 117 kN C0 and 9.54 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22210EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×90 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22210EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×90 mm envelope is identical.",
      "The 125/117 kN ratings, 9.54 kN Pu and 616 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EMD1?",
        "a": "22210EMD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 125 kN, C0 117 kN, Pu 9.54 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 616 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22210EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22210EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 125 kN C / 117 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22210EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210emd1",
      "＊22210emd1",
      "22210EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22210EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22210EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 90,
    "B_mm": 23,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 125,
    "static_load_kN": 117,
    "fatigue_load_limit_kN": 9.54,
    "limiting_speed_rpm": 5700,
    "max_rpm": 5700,
    "speed_oil_rpm": 7200,
    "weight_g": 604,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22210EMKD1 identifies a 50×90×23 mm (1.969 × 3.543 × 0.906 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 50 mm bore; the 23 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22210EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 5,700 r/min limiting value is .79 of the 7,200 r/min oil value; heavy 23 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22210EMKD1 on its adapter or withdrawal sleeve on the 50 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22210EMKD1 is greased for life.",
      "Oil relubrication toward 7,200 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 7,200 r/min needs drain and level design; flooding the 23 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22210EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 125 kN rating no longer applies.",
      "The 125/117 kN ratings, 9.54 kN Pu and 604 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22210EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22210EMKD1?",
        "a": "22210EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 90 mm OD and 23 mm width (1.969 × 3.543 × 0.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 125 kN, C0 117 kN, Pu 9.54 kN, grease limiting speed 5,700 r/min, oil 7,200 r/min, mass about 604 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22210EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22210EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22210EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22210EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22210EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22210EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 125 kN C / 117 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22210EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22210EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22210emkd1",
      "＊22210emkd1",
      "22210EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21310C",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21310C",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 13.7,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5200,
    "weight_g": 1210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21310C belongs to the 21300 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 50×110 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 4,000 r/min limiting value is .77 of the 5,200 r/min oil value; heavy 27 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 50 mm set.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21310C is greased for life.",
      "Do not confuse EA and EM at the same number: 21310C carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×110 mm envelope is identical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21310C in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21310C in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21310C on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 131/127 kN ratings, 13.7 kN Pu and 1210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21310C (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21310C?",
        "a": "21310C is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 131 kN, C0 127 kN, Pu 13.7 kN, grease limiting speed 4,000 r/min, oil 5,200 r/min, mass about 1210 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21310C has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21310CK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21310C is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21310C?",
        "a": "21310C is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21310C take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 131 kN C / 127 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21310CK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21310CK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21310c",
      "21310C"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21310CK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21310CK",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 27,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 131,
    "static_load_kN": 127,
    "fatigue_load_limit_kN": 13.7,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5200,
    "weight_g": 1190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 50 mm shaft, NTN supplies 21310CK: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 5,200 r/min. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 50 mm (two-digit code ×5, with the 00–03 exception table), and 110 mm OD / 27 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 27 mm-wide ring seats fully on both sides. Never mount 21310CK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 110 mm race.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21310CK is greased for life.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21310CK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21310CK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "The 131/127 kN ratings, 13.7 kN Pu and 1190 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21310CK (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21310CK?",
        "a": "21310CK is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 27 mm width (1.969 × 4.331 × 1.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 131 kN, C0 127 kN, Pu 13.7 kN, grease limiting speed 4,000 r/min, oil 5,200 r/min, mass about 1190 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21310CK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21310C."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21310CK is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21310CK?",
        "a": "21310CK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21310CK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 131 kN C / 127 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21310C",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21310C — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21310ck",
      "21310CK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 50 mm shaft, NTN supplies 22310EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 5,300 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22310EAD1 is assembled exactly in that order. NTN prints two speeds for 22310EAD1: 4,300 r/min grease and 5,300 r/min oil — the gap of 1,000 r/min reflects oil cooling of the heavy roller set. Speed planning: 4,300 r/min grease limiting speed is the cage/kinematic ceiling and 5,300 r/min is the oil-lubricated value for the 50 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22310EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EAD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22310EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 50×110 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 5,300 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 250/232 kN ratings, 14 kN Pu and 1820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EAD1?",
        "a": "22310EAD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1820 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22310EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22310EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22310EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310ead1",
      "＊22310ead1",
      "22310EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22310EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 50 mm shaft — 250 kN basic dynamic capacity in a 1790 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 50 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22310EAKD1: 4,300 r/min grease and 5,300 r/min oil — the gap of 1,000 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 4,300 r/min limiting value is .81 of the 5,300 r/min oil value; heavy 40 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22310EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EAKD1 is greased for life.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 50 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22310EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 5,300 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 250/232 kN ratings, 14 kN Pu and 1790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EAKD1?",
        "a": "22310EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1790 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22310EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22310EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22310EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310eakd1",
      "＊22310eakd1",
      "22310EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1840,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22310EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 50 mm bore, 110 mm OD, 40 mm width, rated 4,300 r/min on grease. Numbering ties 22310EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 50 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Speed planning: 4,300 r/min grease limiting speed is the cage/kinematic ceiling and 5,300 r/min is the oil-lubricated value for the 50 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 50 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EMD1 is greased for life.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 40 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22310EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 50 mm bearing, and drive-up procedures differ.",
      "Never substitute 22310EMD1 by envelope alone: the 232 kN C0 and 14 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 250/232 kN ratings, 14 kN Pu and 1840 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EMD1?",
        "a": "22310EMD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1840 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22310EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22310EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22310EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310emd1",
      "＊22310emd1",
      "22310EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22310EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22310EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 50,
    "D_mm": 110,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 250,
    "static_load_kN": 232,
    "fatigue_load_limit_kN": 14,
    "limiting_speed_rpm": 4300,
    "max_rpm": 4300,
    "speed_oil_rpm": 5300,
    "weight_g": 1800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22310EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 50×110×40 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22310EMKD1 is assembled exactly in that order. The 30.0 mm radial section over the 50 mm bore carries two roller rows; capacity per millimetre of bore is about 5.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 50 mm bore is 1.969 in and 110 mm OD is 4.331 in; the ISO 15 envelope swaps between brands, but the 250/232 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 40 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 50 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22310EMKD1 is greased for life.",
      "Never substitute 22310EMKD1 by envelope alone: the 232 kN C0 and 14 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22310EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22310EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 250/232 kN ratings, 14 kN Pu and 1800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22310EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22310EMKD1?",
        "a": "22310EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 50 mm bore, 110 mm OD and 40 mm width (1.969 × 4.331 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 250 kN, C0 232 kN, Pu 14 kN, grease limiting speed 4,300 r/min, oil 5,300 r/min, mass about 1800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22310EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22310EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22310EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22310EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22310EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22310EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 250 kN C / 232 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22310EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22310EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22310emkd1",
      "＊22310emkd1",
      "22310EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 155,
    "static_load_kN": 148,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 830,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 55 mm shaft, NTN supplies 22211EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 6,700 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22211EAD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 155 kN, C0 148 kN (C0/C ≈ 0.95), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 0.95 (148/155 kN) reflects the heavy static and shock proportioning of 22211EAD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22211EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EAD1 is greased for life.",
      "Never substitute 22211EAD1 by envelope alone: the 148 kN C0 and 12.6 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 25 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 155/148 kN ratings, 12.6 kN Pu and 830 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EAD1?",
        "a": "22211EAD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 148 kN, Pu 12.6 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 830 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22211EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22211EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 155 kN C / 148 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22211EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211ead1",
      "＊22211ead1",
      "22211EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 155,
    "static_load_kN": 148,
    "fatigue_load_limit_kN": 12.6,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 814,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22211EAKD1 denotes the 55 mm bore spherical roller bearing (155 kN C / 148 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 55×100 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 55 mm bore assembly. Equivalent-load planning keeps a radial plus moderate axial combination on 22211EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 25 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EAKD1 is greased for life.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 25 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22211EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22211EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×100 mm envelope is identical.",
      "The 155/148 kN ratings, 12.6 kN Pu and 814 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EAKD1?",
        "a": "22211EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 155 kN, C0 148 kN, Pu 12.6 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 814 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22211EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22211EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 155 kN C / 148 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22211EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211eakd1",
      "＊22211eakd1",
      "22211EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 148,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 11.9,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 827,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22211EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 55 mm bore, 100 mm OD, 25 mm width, rated 5,300 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22211EMD1 is assembled exactly in that order. Open by design, 22211EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22211EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 55 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EMD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 5,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 148 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 148 kN rating no longer applies.",
      "The 148/140 kN ratings, 11.9 kN Pu and 827 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EMD1?",
        "a": "22211EMD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 148 kN, C0 140 kN, Pu 11.9 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 827 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22211EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22211EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 148 kN C / 140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22211EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211emd1",
      "＊22211emd1",
      "22211EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22211EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22211EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 100,
    "B_mm": 25,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 148,
    "static_load_kN": 140,
    "fatigue_load_limit_kN": 11.9,
    "limiting_speed_rpm": 5300,
    "max_rpm": 5300,
    "speed_oil_rpm": 6700,
    "weight_g": 811,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22211EMKD1 identifies a 55×100×25 mm (2.165 × 3.937 × 0.984 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 22211EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 55 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 5,300 r/min limiting value is .79 of the 6,700 r/min oil value; heavy 25 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 55 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22211EMKD1 is greased for life.",
      "Never substitute 22211EMKD1 by envelope alone: the 140 kN C0 and 11.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22211EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "The 148/140 kN ratings, 11.9 kN Pu and 811 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22211EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22211EMKD1?",
        "a": "22211EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 100 mm OD and 25 mm width (2.165 × 3.937 × 0.984 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 148 kN, C0 140 kN, Pu 11.9 kN, grease limiting speed 5,300 r/min, oil 6,700 r/min, mass about 811 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22211EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22211EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22211EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22211EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22211EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22211EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 148 kN C / 140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22211EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22211EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22211emkd1",
      "＊22211emkd1",
      "22211EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21311-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21311",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 161,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 16.1,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4800,
    "weight_g": 1710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 55 mm shaft, NTN supplies 21311: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 4,800 r/min. Numbering ties 21311 to its envelope and execution: same-number EA versus EM or plain variants share the 55 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the C design-code cage. The 32.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 29 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 21311 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21311 is greased for life.",
      "Do not confuse EA and EM at the same number: 21311 carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 29 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 21311 by envelope alone: the 163 kN C0 and 16.1 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 21311 by envelope alone: the 163 kN C0 and 16.1 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The 161/163 kN ratings, 16.1 kN Pu and 1710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21311 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21311?",
        "a": "21311 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 161 kN, C0 163 kN, Pu 16.1 kN, grease limiting speed 3,700 r/min, oil 4,800 r/min, mass about 1710 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21311 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21311K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21311 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21311?",
        "a": "21311 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21311 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 161 kN C / 163 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21311",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21311-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21311K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21311K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21311",
      "21311-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21311K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21311K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 29,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 161,
    "static_load_kN": 163,
    "fatigue_load_limit_kN": 16.1,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4800,
    "weight_g": 1690,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21311K is the C design-code execution of NTN's spherical roller range for a 55 mm shaft — 161 kN basic dynamic capacity in a 1690 g, open ISO 15 envelope. Reading the full code: the number gives the 55×120 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 55 mm bore assembly. Selection: the C0/C ratio of 1.01 (163/161 kN) reflects the heavy static and shock proportioning of 21311K; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 55 mm set.",
    "applications": [
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 21311K is greased for life.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21311K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,800 r/min needs drain and level design; flooding the 29 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 21311K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "The 161/163 kN ratings, 16.1 kN Pu and 1690 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21311K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21311K?",
        "a": "21311K is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 29 mm width (2.165 × 4.724 × 1.142 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 161 kN, C0 163 kN, Pu 16.1 kN, grease limiting speed 3,700 r/min, oil 4,800 r/min, mass about 1690 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21311K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21311."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21311K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21311K?",
        "a": "21311K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21311K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 161 kN C / 163 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21311-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21311-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21311k",
      "21311K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22311EAD1 identifies a 55×120×43 mm (2.165 × 4.724 × 1.693 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 55 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 43 mm width follow the general plan. At 296 kN C and 2310 g mass the 22300 series part is built for shock and vibration; the 43 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 17.4 kN against C0 274 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22311EAD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22311EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EAD1 is greased for life.",
      "The cylindrical-bore 22311EAD1 and its tapered-bore counterpart 22311EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22311EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EAD1?",
        "a": "22311EAD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2310 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22311EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22311EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22311EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311ead1",
      "＊22311ead1",
      "22311EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2260,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22311EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 55 mm shaft — 296 kN basic dynamic capacity in a 2260 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22311EAKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 5.4 kN of C per millimetre of the 55 mm bore, 22311EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 22311EAKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 120 mm race.",
    "applications": [
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load",
      "marine propulsion auxiliary shafts",
      "vibrating screen and feeder shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EAKD1 is greased for life.",
      "Oil relubrication toward 4,800 r/min needs drain and level design; flooding the 43 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22311EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22311EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22311EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2260 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EAKD1?",
        "a": "22311EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2260 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22311EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22311EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22311EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311eakd1",
      "＊22311eakd1",
      "22311EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22311EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 55 mm shaft — 296 kN basic dynamic capacity in a 2340 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 55 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 43 mm width follow the general plan. The cylindrical bore fits a machined 55 mm shaft seat directly; the same envelope in 22311EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Selection: the C0/C ratio of 0.93 (274/296 kN) reflects the heavy static and shock proportioning of 22311EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 55 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "vibrating screen and feeder shafts",
      "industrial gearbox and reducer shafts",
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EMD1 is greased for life.",
      "Do not confuse EA and EM at the same number: 22311EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,800 r/min needs drain and level design; flooding the 43 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22311EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 55×120 mm envelope is identical.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2340 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EMD1?",
        "a": "22311EMD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2340 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22311EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22311EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22311EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311emd1",
      "＊22311emd1",
      "22311EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22311EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22311EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 55,
    "D_mm": 120,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 296,
    "static_load_kN": 274,
    "fatigue_load_limit_kN": 17.4,
    "limiting_speed_rpm": 3900,
    "max_rpm": 3900,
    "speed_oil_rpm": 4800,
    "weight_g": 2290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22311EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 55×120×43 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 55 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 43 mm width follow the general plan. Two symmetric roller rows share the load: C 296 kN, C0 274 kN (C0/C ≈ 0.93), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 2290 g (2.29 kg) for the 55×120×43 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 22311EMKD1 on its adapter or withdrawal sleeve on the 55 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "conveyor pulley and elevator drum shafts",
      "stone crusher and screen eccentric shafts",
      "papermaking and printing press rolls",
      "pump and fan shafts under heavy belt load"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Vibrating-duty 55 mm bearings need the right clearance class and secure fits; verify the k5/m5 seat and relubrication routing rather than assuming the open 22311EMKD1 is greased for life.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 55 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 55 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 296/274 kN ratings, 17.4 kN Pu and 2290 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22311EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22311EMKD1?",
        "a": "22311EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 55 mm bore, 120 mm OD and 43 mm width (2.165 × 4.724 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 296 kN, C0 274 kN, Pu 17.4 kN, grease limiting speed 3,900 r/min, oil 4,800 r/min, mass about 2290 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22311EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22311EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22311EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22311EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22311EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22311EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 296 kN C / 274 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22311EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22311EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22311emkd1",
      "＊22311emkd1",
      "22311EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 187,
    "static_load_kN": 181,
    "fatigue_load_limit_kN": 15.4,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22212EAD1 identifies a 60×110×28 mm (2.362 × 4.331 × 1.102 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 22212EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 60 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. The 25.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 28 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22212EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1140 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22212EAD1 by envelope alone: the 181 kN C0 and 15.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 187/181 kN ratings, 15.4 kN Pu and 1140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EAD1?",
        "a": "22212EAD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 181 kN, Pu 15.4 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1140 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22212EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22212EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 187 kN C / 181 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22212EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212ead1",
      "＊22212ead1",
      "22212EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 187,
    "static_load_kN": 181,
    "fatigue_load_limit_kN": 15.4,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22212EAKD1 denotes the 60 mm bore spherical roller bearing (187 kN C / 181 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22212EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 60 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22212EAKD1: 4,800 r/min grease and 6,000 r/min oil — the gap of 1,200 r/min reflects oil cooling of the heavy roller set. 60 mm bore is 2.362 in and 110 mm OD is 4.331 in; the ISO 15 envelope swaps between brands, but the 187/181 kN ratings and cage design are NTN 2203E values. Mount 22212EAKD1 on its adapter or withdrawal sleeve on the 60 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1120 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22212EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 60 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 6,000 r/min needs drain and level design; flooding the 28 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 187/181 kN ratings, 15.4 kN Pu and 1120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EAKD1?",
        "a": "22212EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 187 kN, C0 181 kN, Pu 15.4 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1120 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22212EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22212EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 187 kN C / 181 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22212EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212eakd1",
      "＊22212eakd1",
      "22212EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 179,
    "static_load_kN": 171,
    "fatigue_load_limit_kN": 14.6,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22212EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 60 mm shaft — 179 kN basic dynamic capacity in a 1150 g, open ISO 15 envelope. Numbering ties 22212EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 60 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 25.0 mm radial section over the 60 mm bore carries two roller rows; capacity per millimetre of bore is about 3.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 4,800 r/min limiting value is .80 of the 6,000 r/min oil value; heavy 28 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 60 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The cylindrical-bore 22212EMD1 and its tapered-bore counterpart 22212EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 28 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22212EMD1 and its tapered-bore counterpart 22212EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 179/171 kN ratings, 14.6 kN Pu and 1150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EMD1?",
        "a": "22212EMD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 179 kN, C0 171 kN, Pu 14.6 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1150 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22212EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22212EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 179 kN C / 171 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22212EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212emd1",
      "＊22212emd1",
      "22212EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22212EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22212EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 110,
    "B_mm": 28,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 179,
    "static_load_kN": 171,
    "fatigue_load_limit_kN": 14.6,
    "limiting_speed_rpm": 4800,
    "max_rpm": 4800,
    "speed_oil_rpm": 6000,
    "weight_g": 1130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22212EMKD1 identifies a 60×110×28 mm (2.362 × 4.331 × 1.102 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 28 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 25.0 mm radial section over the 60 mm bore carries two roller rows; capacity per millimetre of bore is about 3.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 3.0 kN of C per millimetre of the 60 mm bore, 22212EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 60 mm set.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 1130 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22212EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 60×110 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 28 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22212EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 179/171 kN ratings, 14.6 kN Pu and 1130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22212EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22212EMKD1?",
        "a": "22212EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 110 mm OD and 28 mm width (2.362 × 4.331 × 1.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 179 kN, C0 171 kN, Pu 14.6 kN, grease limiting speed 4,800 r/min, oil 6,000 r/min, mass about 1130 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22212EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22212EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22212EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22212EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22212EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22212EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 179 kN C / 171 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22212EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22212EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22212emkd1",
      "＊22212emkd1",
      "22212EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21312-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21312",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 186,
    "static_load_kN": 191,
    "fatigue_load_limit_kN": 28.2,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4400,
    "weight_g": 2100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21312 is the C design-code execution of NTN's spherical roller range for a 60 mm shaft — 186 kN basic dynamic capacity in a 2100 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 60 mm (two-digit code ×5, with the 00–03 exception table), and 130 mm OD / 31 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 21312; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 21312 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 60 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21312 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 186/191 kN ratings, 28.2 kN Pu and 2100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21312 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21312?",
        "a": "21312 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 186 kN, C0 191 kN, Pu 28.2 kN, grease limiting speed 3,400 r/min, oil 4,400 r/min, mass about 2100 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21312 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21312K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21312 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21312?",
        "a": "21312 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21312 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 186 kN C / 191 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21312",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21312-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 60×130×31 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21312K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21312K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21312",
      "21312-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21312K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21312K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 186,
    "static_load_kN": 191,
    "fatigue_load_limit_kN": 28.2,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4400,
    "weight_g": 2070,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21312K belongs to the 21300 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (K), lubrication feature (none); 21312K is assembled exactly in that order. Open by design, 21312K requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 3,400 r/min grease limiting speed is the cage/kinematic ceiling and 4,400 r/min is the oil-lubricated value for the 60 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 21312K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2070 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21312K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 186 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 60 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 186 kN rating no longer applies.",
      "The 186/191 kN ratings, 28.2 kN Pu and 2070 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21312K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21312K?",
        "a": "21312K is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 31 mm width (2.362 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 186 kN, C0 191 kN, Pu 28.2 kN, grease limiting speed 3,400 r/min, oil 4,400 r/min, mass about 2070 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21312K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21312."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21312K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21312K?",
        "a": "21312K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21312K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 186 kN C / 191 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21312-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21312-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21312k",
      "21312K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2860,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 60 mm shaft, NTN supplies 22312EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 340 kN, C0 319 kN (C0/C ≈ 0.94), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 3,600 r/min grease limiting speed is the cage/kinematic ceiling and 4,600 r/min is the oil-lubricated value for the 60 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 22312EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2860 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22312EAD1 by envelope alone: the 319 kN C0 and 20.3 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22312EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 22312EAD1 and its tapered-bore counterpart 22312EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 60 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2860 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EAD1?",
        "a": "22312EAD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2860 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22312EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22312EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22312EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312ead1",
      "＊22312ead1",
      "22312EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22312EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 60 mm shaft — 340 kN basic dynamic capacity in a 2800 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 340 kN C and 2800 g mass the 22300 series part is built for shock and vibration; the 46 mm-wide ring needs square abutments to keep both rows equally loaded. With about 5.7 kN of C per millimetre of the 60 mm bore, 22312EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2800 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22312EAKD1 by envelope alone: the 319 kN C0 and 20.3 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 340 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 60 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EAKD1?",
        "a": "22312EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22312EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22312EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22312EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312eakd1",
      "＊22312eakd1",
      "22312EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 60 mm shaft, NTN supplies 22312EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 4,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 60 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 35.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 60 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2910 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 60 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 46 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22312EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2910 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EMD1?",
        "a": "22312EMD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2910 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22312EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22312EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22312EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312emd1",
      "＊22312emd1",
      "22312EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22312EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22312EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 60,
    "D_mm": 130,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 340,
    "static_load_kN": 319,
    "fatigue_load_limit_kN": 20.3,
    "limiting_speed_rpm": 3600,
    "max_rpm": 3600,
    "speed_oil_rpm": 4600,
    "weight_g": 2850,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22312EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 60×130×46 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22312EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 60 mm bore assembly. With about 5.7 kN of C per millimetre of the 60 mm bore, 22312EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 60 mm ring with induction heat or the sleeve drive-up procedure; at 2850 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22312EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 60×130 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22312EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22312EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 60×130 mm envelope is identical.",
      "The 340/319 kN ratings, 20.3 kN Pu and 2850 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22312EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22312EMKD1?",
        "a": "22312EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 60 mm bore, 130 mm OD and 46 mm width (2.362 × 5.118 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 340 kN, C0 319 kN, Pu 20.3 kN, grease limiting speed 3,600 r/min, oil 4,600 r/min, mass about 2850 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22312EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22312EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22312EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22312EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22312EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22312EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 340 kN C / 319 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22312EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22312EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=207",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22312emkd1",
      "＊22312emkd1",
      "22312EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 226,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 18.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1520,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 65 mm shaft, NTN supplies 22213EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 5,500 r/min. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 65 mm (two-digit code ×5, with the 00–03 exception table), and 120 mm OD / 31 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22213EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22213EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 120 mm race.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1520 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 226 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 65 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22213EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 226/224 kN ratings, 18.2 kN Pu and 1520 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EAD1?",
        "a": "22213EAD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 226 kN, C0 224 kN, Pu 18.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1520 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22213EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22213EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 226 kN C / 224 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22213EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213ead1",
      "＊22213ead1",
      "22213EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 226,
    "static_load_kN": 224,
    "fatigue_load_limit_kN": 18.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22213EAKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 65×120 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 22213EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 65 mm bore is 2.559 in and 120 mm OD is 4.724 in; the ISO 15 envelope swaps between brands, but the 226/224 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 65 mm set.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1490 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22213EAKD1 by envelope alone: the 224 kN C0 and 18.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22213EAKD1 by envelope alone: the 224 kN C0 and 18.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 226 kN rating no longer applies.",
      "The 226/224 kN ratings, 18.2 kN Pu and 1490 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EAKD1?",
        "a": "22213EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 226 kN, C0 224 kN, Pu 18.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1490 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22213EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22213EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 226 kN C / 224 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22213EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213eakd1",
      "＊22213eakd1",
      "22213EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 217,
    "static_load_kN": 212,
    "fatigue_load_limit_kN": 17.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 65 mm shaft, NTN supplies 22213EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 5,500 r/min. Digit by digit the code reads as spherical-roller dimension series plus 65 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 22213EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 22213EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 65 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 5,500 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 5,500 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22213EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 217/212 kN ratings, 17.2 kN Pu and 1530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EMD1?",
        "a": "22213EMD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 217 kN, C0 212 kN, Pu 17.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1530 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22213EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22213EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 217 kN C / 212 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22213EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213emd1",
      "＊22213emd1",
      "22213EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22213EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22213EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 120,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 217,
    "static_load_kN": 212,
    "fatigue_load_limit_kN": 17.2,
    "limiting_speed_rpm": 4400,
    "max_rpm": 4400,
    "speed_oil_rpm": 5500,
    "weight_g": 1500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22213EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 65 mm shaft — 217 kN basic dynamic capacity in a 1500 g, open ISO 15 envelope. Numbering ties 22213EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 65 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22213EMKD1: 4,400 r/min grease and 5,500 r/min oil — the gap of 1,100 r/min reflects oil cooling of the heavy roller set. 65 mm bore is 2.559 in and 120 mm OD is 4.724 in; the ISO 15 envelope swaps between brands, but the 217/212 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 65 mm set.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 1500 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22213EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 65×120 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 65 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22213EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 5,500 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 217/212 kN ratings, 17.2 kN Pu and 1500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22213EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22213EMKD1?",
        "a": "22213EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 120 mm OD and 31 mm width (2.559 × 4.724 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 217 kN, C0 212 kN, Pu 17.2 kN, grease limiting speed 4,400 r/min, oil 5,500 r/min, mass about 1500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22213EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22213EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22213EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22213EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22213EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22213EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 217 kN C / 212 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22213EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22213EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22213emkd1",
      "＊22213emkd1",
      "22213EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21313-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21313",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 216,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 31,
    "limiting_speed_rpm": 3100,
    "max_rpm": 3100,
    "speed_oil_rpm": 4000,
    "weight_g": 2550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 65 mm shaft, NTN supplies 21313: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 4,000 r/min. Digit by digit the code reads as spherical-roller dimension series plus 65 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 21313 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 3,100 r/min limiting value is .78 of the 4,000 r/min oil value; heavy 33 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 21313 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 140 mm race.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 2550 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21313 in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 65 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 4,000 r/min needs drain and level design; flooding the 33 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 216 kN rating no longer applies.",
      "The 216/228 kN ratings, 31 kN Pu and 2550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21313 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21313?",
        "a": "21313 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 216 kN, C0 228 kN, Pu 31 kN, grease limiting speed 3,100 r/min, oil 4,000 r/min, mass about 2550 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21313 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21313K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21313 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21313?",
        "a": "21313 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21313 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 216 kN C / 228 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21313",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21313-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 65×140×33 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21313K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21313K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21313",
      "21313-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21313K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21313K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 216,
    "static_load_kN": 228,
    "fatigue_load_limit_kN": 31,
    "limiting_speed_rpm": 3100,
    "max_rpm": 3100,
    "speed_oil_rpm": 4000,
    "weight_g": 2510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 21313K with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 65 mm bore, 140 mm OD, 33 mm width, rated 3,100 r/min on grease. Numbering ties 21313K to its envelope and execution: same-number EA versus EM or plain variants share the 65 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 21313K: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. Pu 31 kN against C0 228 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21313K moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 65 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 2510 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21313K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 65 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21313K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 33 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 216/228 kN ratings, 31 kN Pu and 2510 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21313K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21313K?",
        "a": "21313K is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 33 mm width (2.559 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 216 kN, C0 228 kN, Pu 31 kN, grease limiting speed 3,100 r/min, oil 4,000 r/min, mass about 2510 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21313K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21313."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21313K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21313K?",
        "a": "21313K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21313K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 216 kN C / 228 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21313-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21313-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21313k",
      "21313K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3480,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22313EAD1 identifies a 65×140×48 mm (2.559 × 5.512 × 1.89 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 65×140 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Selection: the C0/C ratio of 0.93 (343/369 kN) reflects the heavy static and shock proportioning of 22313EAD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 22313EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 140 mm race.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3480 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 4,100 r/min needs drain and level design; flooding the 48 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22313EAD1 and its tapered-bore counterpart 22313EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22313EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22313EAD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3480 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EAD1?",
        "a": "22313EAD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3480 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22313EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22313EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22313EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313ead1",
      "＊22313ead1",
      "22313EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3410,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22313EAKD1 denotes the 65 mm bore spherical roller bearing (369 kN C / 343 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22313EAKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Catalogue mass 3410 g (3.41 kg) for the 65×140×48 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 48 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3410 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22313EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 65×140 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22313EAKD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3410 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EAKD1?",
        "a": "22313EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3410 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22313EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22313EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22313EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313eakd1",
      "＊22313eakd1",
      "22313EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22313EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 65 mm shaft — 369 kN basic dynamic capacity in a 3500 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22313EMD1 is assembled exactly in that order. The 37.5 mm radial section over the 65 mm bore carries two roller rows; capacity per millimetre of bore is about 5.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 0.93 (343/369 kN) reflects the heavy static and shock proportioning of 22313EMD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 65 mm set.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3500 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22313EMD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22313EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 369 kN rating no longer applies.",
      "The cylindrical-bore 22313EMD1 and its tapered-bore counterpart 22313EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EMD1?",
        "a": "22313EMD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22313EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22313EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22313EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313emd1",
      "＊22313emd1",
      "22313EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22313EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22313EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 65,
    "D_mm": 140,
    "B_mm": 48,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 369,
    "static_load_kN": 343,
    "fatigue_load_limit_kN": 23.4,
    "limiting_speed_rpm": 3300,
    "max_rpm": 3300,
    "speed_oil_rpm": 4100,
    "weight_g": 3430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22313EMKD1 identifies a 65×140×48 mm (2.559 × 5.512 × 1.89 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 65 mm (two-digit code ×5, with the 00–03 exception table), and 140 mm OD / 48 mm width follow the general plan. At 369 kN C and 3430 g mass the 22300 series part is built for shock and vibration; the 48 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 23.4 kN against C0 343 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22313EMKD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 65 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 65 mm ring with induction heat or the sleeve drive-up procedure; at 3430 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 65 mm bearing, and drive-up procedures differ.",
      "Never substitute 22313EMKD1 by envelope alone: the 343 kN C0 and 23.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22313EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 369/343 kN ratings, 23.4 kN Pu and 3430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22313EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22313EMKD1?",
        "a": "22313EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 65 mm bore, 140 mm OD and 48 mm width (2.559 × 5.512 × 1.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 369 kN, C0 343 kN, Pu 23.4 kN, grease limiting speed 3,300 r/min, oil 4,100 r/min, mass about 3430 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22313EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22313EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22313EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22313EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22313EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22313EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 369 kN C / 343 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22313EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22313EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22313emkd1",
      "＊22313emkd1",
      "22313EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1610,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22214EAD1 identifies a 70×125×31 mm (2.756 × 4.921 × 1.22 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 70 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22214EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 4,100 r/min limiting value is .79 of the 5,200 r/min oil value; heavy 31 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 22214EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 125 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1610 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 70 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22214EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×125 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 235 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 235 kN rating no longer applies.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1610 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EAD1?",
        "a": "22214EAD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1610 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22214EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22214EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22214EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214ead1",
      "＊22214ead1",
      "22214EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1580,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22214EAKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22214EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 70 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22214EAKD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. With about 3.4 kN of C per millimetre of the 70 mm bore, 22214EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 70 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1580 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22214EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1580 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EAKD1?",
        "a": "22214EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1580 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22214EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22214EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22214EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214eakd1",
      "＊22214eakd1",
      "22214EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22214EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 70 mm shaft — 235 kN basic dynamic capacity in a 1640 g, open ISO 15 envelope. Reading the full code: the number gives the 70×125 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 22214EMD1: 4,100 r/min grease and 5,200 r/min oil — the gap of 1,100 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 4,100 r/min limiting value is .79 of the 5,200 r/min oil value; heavy 31 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 70 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1640 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 235 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 70 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The cylindrical-bore 22214EMD1 and its tapered-bore counterpart 22214EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 5,200 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1640 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EMD1?",
        "a": "22214EMD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1640 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22214EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22214EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22214EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214emd1",
      "＊22214emd1",
      "22214EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22214EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22214EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 125,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 235,
    "static_load_kN": 240,
    "fatigue_load_limit_kN": 20.1,
    "limiting_speed_rpm": 4100,
    "max_rpm": 4100,
    "speed_oil_rpm": 5200,
    "weight_g": 1600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22214EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 70 mm shaft — 235 kN basic dynamic capacity in a 1600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 70 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 1600 g (1.60 kg) for the 70×125×31 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 1600 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 70 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 5,200 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22214EMKD1 by envelope alone: the 240 kN C0 and 20.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22214EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 235/240 kN ratings, 20.1 kN Pu and 1600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22214EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22214EMKD1?",
        "a": "22214EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 125 mm OD and 31 mm width (2.756 × 4.921 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 235 kN, C0 240 kN, Pu 20.1 kN, grease limiting speed 4,100 r/min, oil 5,200 r/min, mass about 1600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22214EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22214EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22214EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22214EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22214EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22214EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 235 kN C / 240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22214EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22214EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22214emkd1",
      "＊22214emkd1",
      "22214EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21314-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21314",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 245,
    "static_load_kN": 262,
    "fatigue_load_limit_kN": 33.5,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3800,
    "weight_g": 3180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21314 is the C design-code execution of NTN's spherical roller range for a 70 mm shaft — 245 kN basic dynamic capacity in a 3180 g, open ISO 15 envelope. Reading the full code: the number gives the 70×150 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 21314: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; quote the full code because each suffix is a distinct article. 70 mm bore is 2.756 in and 150 mm OD is 5.906 in; the ISO 15 envelope swaps between brands, but the 245/262 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 35 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 3180 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 21314 by envelope alone: the 262 kN C0 and 33.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21314 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 35 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 35 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 245/262 kN ratings, 33.5 kN Pu and 3180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21314 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21314?",
        "a": "21314 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 245 kN, C0 262 kN, Pu 33.5 kN, grease limiting speed 2,900 r/min, oil 3,800 r/min, mass about 3180 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21314 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21314K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21314 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21314?",
        "a": "21314 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21314 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 245 kN C / 262 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21314",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21314-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 70×150×35 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21314K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21314K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21314",
      "21314-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21314K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21314K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 35,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 245,
    "static_load_kN": 262,
    "fatigue_load_limit_kN": 33.5,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3800,
    "weight_g": 3140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21314K identifies a 70×150×35 mm (2.756 × 5.906 × 1.378 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 70 mm (two-digit code ×5, with the 00–03 exception table), and 150 mm OD / 35 mm width follow the general plan. NTN prints two speeds for 21314K: 2,900 r/min grease and 3,800 r/min oil — the gap of 900 r/min reflects oil cooling of the heavy roller set. Catalogue mass 3140 g (3.14 kg) for the 70×150×35 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 21314K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 3140 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 21314K by envelope alone: the 262 kN C0 and 33.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21314K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 35 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 3,800 r/min needs drain and level design; flooding the 35 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 245/262 kN ratings, 33.5 kN Pu and 3140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21314K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21314K?",
        "a": "21314K is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 35 mm width (2.756 × 5.906 × 1.378 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 245 kN, C0 262 kN, Pu 33.5 kN, grease limiting speed 2,900 r/min, oil 3,800 r/min, mass about 3140 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21314K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21314."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21314K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21314K?",
        "a": "21314K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21314K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 245 kN C / 262 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21314-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21314-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21314k",
      "21314K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22314EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22314EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 70 mm shaft seat directly; the same envelope in 22314EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 51 mm-wide ring seats fully on both sides. Never mount 22314EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 150 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4250 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 420 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22314EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22314EAD1 by envelope alone: the 396 kN C0 and 26 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22314EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×150 mm envelope is identical.",
      "The 420/396 kN ratings, 26 kN Pu and 4250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EAD1?",
        "a": "22314EAD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4250 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22314EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22314EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22314EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314ead1",
      "＊22314ead1",
      "22314EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22314EAKD1 denotes the 70 mm bore spherical roller bearing (420 kN C / 396 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 70 mm bore; the 51 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 26 kN is the catalogue fatigue load limit for 22314EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 4160 g (4.16 kg) for the 70×150×51 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 22314EAKD1 on its adapter or withdrawal sleeve on the 70 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4160 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22314EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×150 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 70 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22314EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22314EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 420/396 kN ratings, 26 kN Pu and 4160 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EAKD1?",
        "a": "22314EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4160 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22314EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22314EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22314EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314eakd1",
      "＊22314eakd1",
      "22314EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 70 mm shaft, NTN supplies 22314EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,800 r/min. Numbering ties 22314EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 70 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22314EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 51 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 70 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4310 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,800 r/min needs drain and level design; flooding the 51 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22314EMD1 and its tapered-bore counterpart 22314EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 22314EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 70×150 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 51 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 420/396 kN ratings, 26 kN Pu and 4310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EMD1?",
        "a": "22314EMD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4310 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22314EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22314EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22314EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314emd1",
      "＊22314emd1",
      "22314EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22314EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22314EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 70,
    "D_mm": 150,
    "B_mm": 51,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 420,
    "static_load_kN": 396,
    "fatigue_load_limit_kN": 26,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4220,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22314EMKD1 identifies a 70×150×51 mm (2.756 × 5.906 × 2.008 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22314EMKD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 420 kN, C0 396 kN (C0/C ≈ 0.94), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 4220 g (4.22 kg) for the 70×150×51 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 22314EMKD1 on its adapter or withdrawal sleeve on the 70 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 70 mm ring with induction heat or the sleeve drive-up procedure; at 4220 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22314EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 420 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 70 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 420/396 kN ratings, 26 kN Pu and 4220 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22314EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22314EMKD1?",
        "a": "22314EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 70 mm bore, 150 mm OD and 51 mm width (2.756 × 5.906 × 2.008 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 420 kN, C0 396 kN, Pu 26 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4220 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22314EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22314EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22314EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22314EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22314EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22314EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 420 kN C / 396 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22314EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22314EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22314emkd1",
      "＊22314emkd1",
      "22314EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22215EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 75×130 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The 27.5 mm radial section over the 75 mm bore carries two roller rows; capacity per millimetre of bore is about 3.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 75 mm bore is 2.953 in and 130 mm OD is 5.118 in; the ISO 15 envelope swaps between brands, but the 244/249 kN ratings and cage design are NTN 2203E values. Never mount 22215EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 130 mm race.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1670 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22215EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 244 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22215EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 75×130 mm envelope is identical.",
      "The cylindrical-bore 22215EAD1 and its tapered-bore counterpart 22215EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EAD1?",
        "a": "22215EAD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1670 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22215EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22215EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22215EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215ead1",
      "＊22215ead1",
      "22215EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1640,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22215EAKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 75 mm bore; the 31 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Pu 21.1 kN against C0 249 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22215EAKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 75 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1640 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 31 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22215EAKD1 by envelope alone: the 249 kN C0 and 21.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22215EAKD1 by envelope alone: the 249 kN C0 and 21.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1640 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EAKD1?",
        "a": "22215EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1640 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22215EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22215EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22215EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215eakd1",
      "＊22215eakd1",
      "22215EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 75 mm shaft, NTN supplies 22215EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 5,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22215EMD1 is assembled exactly in that order. At 244 kN C and 1710 g mass the 22200 series part is built for shock and vibration; the 31 mm-wide ring needs square abutments to keep both rows equally loaded. 75 mm bore is 2.953 in and 130 mm OD is 5.118 in; the ISO 15 envelope swaps between brands, but the 244/249 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 75 mm set.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1710 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22215EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 75×130 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22215EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EMD1?",
        "a": "22215EMD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1710 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22215EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22215EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22215EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215emd1",
      "＊22215emd1",
      "22215EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22215EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22215EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 130,
    "B_mm": 31,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 244,
    "static_load_kN": 249,
    "fatigue_load_limit_kN": 21.1,
    "limiting_speed_rpm": 4000,
    "max_rpm": 4000,
    "speed_oil_rpm": 5000,
    "weight_g": 1670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22215EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 75 mm shaft — 244 kN basic dynamic capacity in a 1670 g, open ISO 15 envelope. Numbering ties 22215EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 75 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 244 kN C and 1670 g mass the 22200 series part is built for shock and vibration; the 31 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 1670 g (1.67 kg) for the 75×130×31 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22215EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 1670 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22215EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22215EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 5,000 r/min needs drain and level design; flooding the 31 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 4,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 244/249 kN ratings, 21.1 kN Pu and 1670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22215EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22215EMKD1?",
        "a": "22215EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 130 mm OD and 31 mm width (2.953 × 5.118 × 1.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 244 kN, C0 249 kN, Pu 21.1 kN, grease limiting speed 4,000 r/min, oil 5,000 r/min, mass about 1670 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22215EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22215EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22215EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22215EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22215EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22215EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 244 kN C / 249 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22215EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22215EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22215emkd1",
      "＊22215emkd1",
      "22215EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21315-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21315",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 266,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 27.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3500,
    "weight_g": 3810,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 75 mm shaft, NTN supplies 21315: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 3,500 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (cylindrical), lubrication feature (none); 21315 is assembled exactly in that order. Pu 27.5 kN is the catalogue fatigue load limit for 21315, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 3.5 kN of C per millimetre of the 75 mm bore, 21315 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 37 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 3810 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,500 r/min needs drain and level design; flooding the 37 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21315 in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 266 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21315 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 266/287 kN ratings, 27.5 kN Pu and 3810 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21315 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21315?",
        "a": "21315 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 287 kN, Pu 27.5 kN, grease limiting speed 2,700 r/min, oil 3,500 r/min, mass about 3810 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21315 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21315K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21315 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21315?",
        "a": "21315 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21315 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 266 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21315",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21315-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 75×160×37 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21315K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21315K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21315",
      "21315-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21315K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21315K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 37,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 266,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 27.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3500,
    "weight_g": 3760,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 21315K denotes the 75 mm bore spherical roller bearing (266 kN C / 287 kN C0) in the 21300 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 75 mm bore; the 37 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 3.5 kN of C per millimetre of the 75 mm bore, 21315K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 21315K on its adapter or withdrawal sleeve on the 75 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 3760 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "The 266/287 kN ratings, 27.5 kN Pu and 3760 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21315K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21315K?",
        "a": "21315K is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 37 mm width (2.953 × 6.299 × 1.457 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 266 kN, C0 287 kN, Pu 27.5 kN, grease limiting speed 2,700 r/min, oil 3,500 r/min, mass about 3760 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21315K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21315."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21315K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21315K?",
        "a": "21315K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21315K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 266 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21315-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21315-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21315k",
      "21315K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22315EAD1 identifies a 75×160×55 mm (2.953 × 6.299 × 2.165 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 22315EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 75 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22315EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22315EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 55 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5180 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 491 kN rating no longer applies.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EAD1?",
        "a": "22315EAD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5180 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22315EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22315EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22315EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315ead1",
      "＊22315ead1",
      "22315EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5070,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22315EAKD1 denotes the 75 mm bore spherical roller bearing (491 kN C / 467 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22315EAKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 75 mm bore assembly. Speed planning: 2,900 r/min grease limiting speed is the cage/kinematic ceiling and 3,600 r/min is the oil-lubricated value for the 75 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 75 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5070 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 75 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22315EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22315EAKD1 by envelope alone: the 467 kN C0 and 29.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22315EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 75×160 mm envelope is identical.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5070 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EAKD1?",
        "a": "22315EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5070 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22315EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22315EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22315EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315eakd1",
      "＊22315eakd1",
      "22315EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22315EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 75 mm shaft — 491 kN basic dynamic capacity in a 5270 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 75 mm (two-digit code ×5, with the 00–03 exception table), and 160 mm OD / 55 mm width follow the general plan. NTN prints two speeds for 22315EMD1: 2,900 r/min grease and 3,600 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 22315EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5270 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 491 kN rating no longer applies.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 55 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 55 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EMD1?",
        "a": "22315EMD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5270 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22315EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22315EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22315EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315emd1",
      "＊22315emd1",
      "22315EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22315EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22315EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 75,
    "D_mm": 160,
    "B_mm": 55,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 491,
    "static_load_kN": 467,
    "fatigue_load_limit_kN": 29.8,
    "limiting_speed_rpm": 2900,
    "max_rpm": 2900,
    "speed_oil_rpm": 3600,
    "weight_g": 5160,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22315EMKD1 identifies a 75×160×55 mm (2.953 × 6.299 × 2.165 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 75 mm (two-digit code ×5, with the 00–03 exception table), and 160 mm OD / 55 mm width follow the general plan. Suffix reading on 22315EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 2,900 r/min grease limiting speed is the cage/kinematic ceiling and 3,600 r/min is the oil-lubricated value for the 75 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 75 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 75 mm ring with induction heat or the sleeve drive-up procedure; at 5160 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 55 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 75 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 55 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 491/467 kN ratings, 29.8 kN Pu and 5160 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22315EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22315EMKD1?",
        "a": "22315EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 75 mm bore, 160 mm OD and 55 mm width (2.953 × 6.299 × 2.165 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 491 kN, C0 467 kN, Pu 29.8 kN, grease limiting speed 2,900 r/min, oil 3,600 r/min, mass about 5160 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22315EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22315EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22315EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22315EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22315EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22315EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 491 kN C / 467 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22315EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22315EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22315emkd1",
      "＊22315emkd1",
      "22315EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 278,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 24,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22216EAD1 identifies a 80×140×33 mm (3.15 × 5.512 × 1.299 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22216EAD1 is assembled exactly in that order. Pu 24 kN is the catalogue fatigue load limit for 22216EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 3.5 kN of C per millimetre of the 80 mm bore, 22216EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 33 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2090 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22216EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 278/287 kN ratings, 24 kN Pu and 2090 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EAD1?",
        "a": "22216EAD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 278 kN, C0 287 kN, Pu 24 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2090 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22216EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22216EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 278 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22216EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216ead1",
      "＊22216ead1",
      "22216EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 278,
    "static_load_kN": 287,
    "fatigue_load_limit_kN": 24,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2050,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 80 mm shaft, NTN supplies 22216EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,600 r/min. Numbering ties 22216EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 80 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22216EAKD1: 3,700 r/min grease and 4,600 r/min oil — the gap of 900 r/min reflects oil cooling of the heavy roller set. Pu 24 kN against C0 287 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22216EAKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22216EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2050 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 80 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 278 kN rating no longer applies.",
      "Oil relubrication toward 4,600 r/min needs drain and level design; flooding the 33 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 4,600 r/min needs drain and level design; flooding the 33 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 278/287 kN ratings, 24 kN Pu and 2050 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EAKD1?",
        "a": "22216EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 278 kN, C0 287 kN, Pu 24 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2050 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22216EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22216EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 278 kN C / 287 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22216EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216eakd1",
      "＊22216eakd1",
      "22216EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 267,
    "static_load_kN": 272,
    "fatigue_load_limit_kN": 22.8,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2110,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22216EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 80 mm shaft — 267 kN basic dynamic capacity in a 2110 g, open ISO 15 envelope. Numbering ties 22216EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 80 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 267 kN, C0 272 kN (C0/C ≈ 1.02), with useful axial capacity in either direction alongside the dominant radial load. With about 3.3 kN of C per millimetre of the 80 mm bore, 22216EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2110 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 22216EMD1 and its tapered-bore counterpart 22216EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 22216EMD1 by envelope alone: the 272 kN C0 and 22.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 267/272 kN ratings, 22.8 kN Pu and 2110 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EMD1?",
        "a": "22216EMD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 267 kN, C0 272 kN, Pu 22.8 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2110 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22216EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22216EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 267 kN C / 272 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22216EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216emd1",
      "＊22216emd1",
      "22216EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22216EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22216EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 140,
    "B_mm": 33,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 267,
    "static_load_kN": 272,
    "fatigue_load_limit_kN": 22.8,
    "limiting_speed_rpm": 3700,
    "max_rpm": 3700,
    "speed_oil_rpm": 4600,
    "weight_g": 2070,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22216EMKD1 denotes the 80 mm bore spherical roller bearing (267 kN C / 272 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 80 mm bore; the 33 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Pu 22.8 kN against C0 272 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22216EMKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22216EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 2070 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22216EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22216EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22216EMKD1 by envelope alone: the 272 kN C0 and 22.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 267/272 kN ratings, 22.8 kN Pu and 2070 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22216EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22216EMKD1?",
        "a": "22216EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 140 mm OD and 33 mm width (3.15 × 5.512 × 1.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 267 kN, C0 272 kN, Pu 22.8 kN, grease limiting speed 3,700 r/min, oil 4,600 r/min, mass about 2070 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22216EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22216EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22216EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22216EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22216EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22216EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 267 kN C / 272 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22216EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22216EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22216emkd1",
      "＊22216emkd1",
      "22216EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21316-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21316",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 289,
    "static_load_kN": 315,
    "fatigue_load_limit_kN": 30.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3300,
    "weight_g": 4530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21316 identifies a 80×170×39 mm (3.15 × 6.693 × 1.535 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 21316 to its envelope and execution: same-number EA versus EM or plain variants share the 80 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 21316: 2,500 r/min grease and 3,300 r/min oil — the gap of 800 r/min reflects oil cooling of the heavy roller set. Catalogue mass 4530 g (4.53 kg) for the 80×170×39 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 39 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 4530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 289 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21316 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 21316 carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 80×170 mm envelope is identical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 39 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 289/315 kN ratings, 30.5 kN Pu and 4530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21316 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21316?",
        "a": "21316 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 289 kN, C0 315 kN, Pu 30.5 kN, grease limiting speed 2,500 r/min, oil 3,300 r/min, mass about 4530 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21316 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21316K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21316 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21316?",
        "a": "21316 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21316 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 289 kN C / 315 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21316",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21316-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 80×170×39 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21316K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21316K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21316",
      "21316-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21316K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21316K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 39,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 289,
    "static_load_kN": 315,
    "fatigue_load_limit_kN": 30.5,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3300,
    "weight_g": 4470,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 80 mm shaft, NTN supplies 21316K: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 3,300 r/min. Reading the full code: the number gives the 80×170 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the C design-code cage. 80 mm bore is 3.15 in and 170 mm OD is 6.693 in; the ISO 15 envelope swaps between brands, but the 289/315 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 4470 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 39 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 39 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 21316K by envelope alone: the 315 kN C0 and 30.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 21316K by envelope alone: the 315 kN C0 and 30.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "The 289/315 kN ratings, 30.5 kN Pu and 4470 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21316K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21316K?",
        "a": "21316K is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 39 mm width (3.15 × 6.693 × 1.535 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 289 kN, C0 315 kN, Pu 30.5 kN, grease limiting speed 2,500 r/min, oil 3,300 r/min, mass about 4470 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21316K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21316."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21316K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21316K?",
        "a": "21316K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21316K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 289 kN C / 315 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21316-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21316-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21316k",
      "21316K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 6120,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22316EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 80 mm (two-digit code ×5, with the 00–03 exception table), and 170 mm OD / 58 mm width follow the general plan. The 45.0 mm radial section over the 80 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 2,700 r/min limiting value is .79 of the 3,400 r/min oil value; heavy 58 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 58 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 6120 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22316EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22316EAD1 by envelope alone: the 522 kN C0 and 32.5 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 3,400 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22316EAD1 and its tapered-bore counterpart 22316EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 541/522 kN ratings, 32.5 kN Pu and 6120 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EAD1?",
        "a": "22316EAD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 6120 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22316EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22316EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22316EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316ead1",
      "＊22316ead1",
      "22316EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 5990,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22316EAKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 80 mm bore; the 58 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 45.0 mm radial section over the 80 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 32.5 kN against C0 522 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22316EAKD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 80 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 5990 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22316EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22316EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22316EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 541/522 kN ratings, 32.5 kN Pu and 5990 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EAKD1?",
        "a": "22316EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 5990 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22316EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22316EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22316EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316eakd1",
      "＊22316eakd1",
      "22316EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 6280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 80 mm shaft, NTN supplies 22316EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 80 mm bore; the 58 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 541 kN C and 6280 g mass the 22300 series part is built for shock and vibration; the 58 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 2,700 r/min limiting value is .79 of the 3,400 r/min oil value; heavy 58 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 6280 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 80 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 80 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 541/522 kN ratings, 32.5 kN Pu and 6280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EMD1?",
        "a": "22316EMD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 6280 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22316EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22316EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22316EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316emd1",
      "＊22316emd1",
      "22316EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22316EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22316EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 80,
    "D_mm": 170,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 541,
    "static_load_kN": 522,
    "fatigue_load_limit_kN": 32.5,
    "limiting_speed_rpm": 2700,
    "max_rpm": 2700,
    "speed_oil_rpm": 3400,
    "weight_g": 6150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22316EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 80 mm shaft — 541 kN basic dynamic capacity in a 6150 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22316EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 80 mm bore assembly. Speed planning: 2,700 r/min grease limiting speed is the cage/kinematic ceiling and 3,400 r/min is the oil-lubricated value for the 80 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 80 mm ring with induction heat or the sleeve drive-up procedure; at 6150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 541 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 541 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22316EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 22316EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 80×170 mm envelope is identical.",
      "The 541/522 kN ratings, 32.5 kN Pu and 6150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22316EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22316EMKD1?",
        "a": "22316EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 80 mm bore, 170 mm OD and 58 mm width (3.15 × 6.693 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 541 kN, C0 522 kN, Pu 32.5 kN, grease limiting speed 2,700 r/min, oil 3,400 r/min, mass about 6150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22316EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22316EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22316EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22316EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22316EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22316EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 541 kN C / 522 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22316EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22316EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22316emkd1",
      "＊22316emkd1",
      "22316EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2590,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22217EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22217EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 85 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22217EAD1: 3,400 r/min grease and 4,300 r/min oil — the gap of 900 r/min reflects oil cooling of the heavy roller set. Catalogue mass 2590 g (2.59 kg) for the 85×150×36 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 36 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2590 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,300 r/min needs drain and level design; flooding the 36 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2590 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EAD1?",
        "a": "22217EAD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2590 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22217EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22217EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22217EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217ead1",
      "＊22217ead1",
      "22217EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2540,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 85 mm shaft, NTN supplies 22217EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,300 r/min. Digit by digit the code reads as spherical-roller dimension series plus 85 mm bore; the 36 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 3,400 r/min grease limiting speed is the cage/kinematic ceiling and 4,300 r/min is the oil-lubricated value for the 85 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2540 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22217EAKD1 by envelope alone: the 330 kN C0 and 27.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EAKD1?",
        "a": "22217EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2540 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22217EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22217EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22217EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217eakd1",
      "＊22217eakd1",
      "22217EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2670,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 85 mm shaft, NTN supplies 22217EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 4,300 r/min. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 85 mm (two-digit code ×5, with the 00–03 exception table), and 150 mm OD / 36 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 2670 g (2.67 kg) for the 85×150×36 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2670 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22217EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "Never substitute 22217EMD1 by envelope alone: the 330 kN C0 and 27.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2670 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EMD1?",
        "a": "22217EMD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2670 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22217EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22217EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22217EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217emd1",
      "＊22217emd1",
      "22217EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22217EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22217EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 150,
    "B_mm": 36,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 324,
    "static_load_kN": 330,
    "fatigue_load_limit_kN": 27.1,
    "limiting_speed_rpm": 3400,
    "max_rpm": 3400,
    "speed_oil_rpm": 4300,
    "weight_g": 2620,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22217EMKD1 denotes the 85 mm bore spherical roller bearing (324 kN C / 330 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22217EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 85 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 27.1 kN is the catalogue fatigue load limit for 22217EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 27.1 kN against C0 330 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22217EMKD1 moves with cleanliness far more than with small C variations. Never mount 22217EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 150 mm race.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 2620 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 324 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22217EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22217EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 324/330 kN ratings, 27.1 kN Pu and 2620 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22217EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22217EMKD1?",
        "a": "22217EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 150 mm OD and 36 mm width (3.346 × 5.906 × 1.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 324 kN, C0 330 kN, Pu 27.1 kN, grease limiting speed 3,400 r/min, oil 4,300 r/min, mass about 2620 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22217EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22217EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22217EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22217EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22217EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22217EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 324 kN C / 330 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22217EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22217EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22217emkd1",
      "＊22217emkd1",
      "22217EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21317-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21317",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 320,
    "static_load_kN": 355,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 5350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 85 mm shaft, NTN supplies 21317: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 3,100 r/min. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 85 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 41 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 45 kN against C0 355 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21317 moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 21317 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 5350 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "The 320/355 kN ratings, 45 kN Pu and 5350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21317 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21317?",
        "a": "21317 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 320 kN, C0 355 kN, Pu 45 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 5350 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21317 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21317K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21317 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21317?",
        "a": "21317 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21317 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 320 kN C / 355 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21317",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21317-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21317K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21317K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21317",
      "21317-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21317K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21317K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 41,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 320,
    "static_load_kN": 355,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 5280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21317K is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 85×180×41 mm to ISO 15, with pressed-steel cage of the 213-series C design. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (K), lubrication feature (none); 21317K is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 2,400 r/min limiting value is .77 of the 3,100 r/min oil value; heavy 41 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 41 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 5280 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 41 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 21317K by envelope alone: the 355 kN C0 and 45 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 320 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21317K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 320/355 kN ratings, 45 kN Pu and 5280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21317K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21317K?",
        "a": "21317K is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 41 mm width (3.346 × 7.087 × 1.614 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 320 kN, C0 355 kN, Pu 45 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 5280 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21317K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21317."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21317K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21317K?",
        "a": "21317K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21317K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 320 kN C / 355 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21317-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21317-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21317k",
      "21317K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22317EAD1 identifies a 85×180×60 mm (3.346 × 7.087 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 85 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 36.4 kN is the catalogue fatigue load limit for 22317EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 85 mm bore is 3.346 in and 180 mm OD is 7.087 in; the ISO 15 envelope swaps between brands, but the 599/604 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 22317EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7180 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22317EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 599 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EAD1?",
        "a": "22317EAD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7180 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22317EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22317EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22317EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317ead1",
      "＊22317ead1",
      "22317EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7040,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22317EAKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22317EAKD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 599 kN, C0 604 kN (C0/C ≈ 1.01), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.01 (604/599 kN) reflects the heavy static and shock proportioning of 22317EAKD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 85 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7040 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22317EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 85×180 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 85 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7040 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EAKD1?",
        "a": "22317EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7040 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22317EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22317EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22317EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317eakd1",
      "＊22317eakd1",
      "22317EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7290,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22317EMD1 identifies a 85×180×60 mm (3.346 × 7.087 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 85×180 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 85 mm bore is 3.346 in and 180 mm OD is 7.087 in; the ISO 15 envelope swaps between brands, but the 599/604 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7290 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22317EMD1 by envelope alone: the 604 kN C0 and 36.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22317EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 85 mm bearing, and drive-up procedures differ.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7290 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EMD1?",
        "a": "22317EMD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7290 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22317EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22317EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22317EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317emd1",
      "＊22317emd1",
      "22317EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22317EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22317EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 85,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 599,
    "static_load_kN": 604,
    "fatigue_load_limit_kN": 36.4,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 7150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22317EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 85 mm shaft — 599 kN basic dynamic capacity in a 7150 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 85 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 60 mm width follow the general plan. Open by design, 22317EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.01 (604/599 kN) reflects the heavy static and shock proportioning of 22317EMKD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 85 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 85 mm ring with induction heat or the sleeve drive-up procedure; at 7150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22317EMKD1 by envelope alone: the 604 kN C0 and 36.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22317EMKD1 by envelope alone: the 604 kN C0 and 36.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 599 kN rating no longer applies.",
      "The 599/604 kN ratings, 36.4 kN Pu and 7150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22317EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22317EMKD1?",
        "a": "22317EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 85 mm bore, 180 mm OD and 60 mm width (3.346 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 599 kN, C0 604 kN, Pu 36.4 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 7150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22317EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22317EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22317EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22317EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22317EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22317EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 599 kN C / 604 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22317EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22317EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22317emkd1",
      "＊22317emkd1",
      "22317EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3340,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22218EAD1 identifies a 90×160×40 mm (3.543 × 6.299 × 1.575 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 4.3 kN of C per millimetre of the 90 mm bore, 22218EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 22218EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3340 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22218EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×160 mm envelope is identical.",
      "Never substitute 22218EAD1 by envelope alone: the 398 kN C0 and 30.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22218EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3340 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EAD1?",
        "a": "22218EAD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3340 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22218EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22218EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22218EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218ead1",
      "＊22218ead1",
      "22218EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 90 mm shaft, NTN supplies 22218EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 4,000 r/min. Numbering ties 22218EAKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 90 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 35.0 mm radial section over the 90 mm bore carries two roller rows; capacity per millimetre of bore is about 4.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 3,200 r/min grease limiting speed is the cage/kinematic ceiling and 4,000 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22218EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3270 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 90 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22218EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22218EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EAKD1?",
        "a": "22218EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3270 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22218EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22218EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22218EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218eakd1",
      "＊22218eakd1",
      "22218EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22218EMD1 identifies a 90×160×40 mm (3.543 × 6.299 × 1.575 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 90 mm shaft seat directly; the same envelope in 22218EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 30.2 kN against C0 398 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22218EMD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3430 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 4,000 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22218EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×160 mm envelope is identical.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EMD1?",
        "a": "22218EMD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3430 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22218EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22218EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22218EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218emd1",
      "＊22218emd1",
      "22218EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22218EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22218EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 40,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 384,
    "static_load_kN": 398,
    "fatigue_load_limit_kN": 30.2,
    "limiting_speed_rpm": 3200,
    "max_rpm": 3200,
    "speed_oil_rpm": 4000,
    "weight_g": 3370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22218EMKD1 denotes the 90 mm bore spherical roller bearing (384 kN C / 398 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 40 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 384 kN C and 3370 g mass the 22200 series part is built for shock and vibration; the 40 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 3,200 r/min grease limiting speed is the cage/kinematic ceiling and 4,000 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22218EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 3370 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22218EMKD1 by envelope alone: the 398 kN C0 and 30.2 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 4,000 r/min needs drain and level design; flooding the 40 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22218EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×160 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 384/398 kN ratings, 30.2 kN Pu and 3370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22218EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22218EMKD1?",
        "a": "22218EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 40 mm width (3.543 × 6.299 × 1.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 384 kN, C0 398 kN, Pu 30.2 kN, grease limiting speed 3,200 r/min, oil 4,000 r/min, mass about 3370 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22218EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22218EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22218EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22218EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22218EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22218EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 384 kN C / 398 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22218EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22218EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22218emkd1",
      "＊22218emkd1",
      "22218EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23218EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23218EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 52.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 467,
    "static_load_kN": 513,
    "fatigue_load_limit_kN": 30,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 4430,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23218EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 90×160×52.4 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23218EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,200 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 90 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 4430 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23218EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 3,200 r/min needs drain and level design; flooding the 52.4 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23218EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 467/513 kN ratings, 30 kN Pu and 4430 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23218EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23218EMD1?",
        "a": "23218EMD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 52.4 mm width (3.543 × 6.299 × 2.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 467 kN, C0 513 kN, Pu 30 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 4430 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23218EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23218EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23218EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23218EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23218EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23218EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 467 kN C / 513 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23218EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23218EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23218emd1",
      "＊23218emd1",
      "23218EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23218EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23218EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 160,
    "B_mm": 52.4,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 467,
    "static_load_kN": 513,
    "fatigue_load_limit_kN": 30,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3200,
    "weight_g": 4310,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23218EMKD1 denotes the 90 mm bore spherical roller bearing (467 kN C / 513 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Numbering ties 23218EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 90 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,200 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23218EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 4310 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 467 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23218EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 467/513 kN ratings, 30 kN Pu and 4310 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23218EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23218EMKD1?",
        "a": "23218EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 160 mm OD and 52.4 mm width (3.543 × 6.299 × 2.063 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 467 kN, C0 513 kN, Pu 30 kN, grease limiting speed 2,600 r/min, oil 3,200 r/min, mass about 4310 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23218EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23218EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23218EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23218EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23218EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23218EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 467 kN C / 513 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23218EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23218EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23218emkd1",
      "＊23218emkd1",
      "23218EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21318-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21318",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 355,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 50.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 3000,
    "weight_g": 6300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 21318 identifies a 90×190×43 mm (3.543 × 7.48 × 1.693 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 90×190 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Two symmetric roller rows share the load: C 355 kN, C0 400 kN (C0/C ≈ 1.13), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 6300 g (6.30 kg) for the 90×190×43 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 21318 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 6300 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21318 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 21318 by envelope alone: the 400 kN C0 and 50.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 90 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 355/400 kN ratings, 50.5 kN Pu and 6300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21318 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21318?",
        "a": "21318 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 400 kN, Pu 50.5 kN, grease limiting speed 2,300 r/min, oil 3,000 r/min, mass about 6300 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21318 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21318K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21318 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21318?",
        "a": "21318 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21318 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 355 kN C / 400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21318",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21318-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 90×190×43 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21318K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21318K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21318",
      "21318-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21318K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21318K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 355,
    "static_load_kN": 400,
    "fatigue_load_limit_kN": 50.5,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 3000,
    "weight_g": 6210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21318K is the C design-code execution of NTN's spherical roller range for a 90 mm shaft — 355 kN basic dynamic capacity in a 6210 g, open ISO 15 envelope. Numbering ties 21318K to its envelope and execution: same-number EA versus EM or plain variants share the 90 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 50.0 mm radial section over the 90 mm bore carries two roller rows; capacity per millimetre of bore is about 3.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 21318K; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 90 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 6210 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 355 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21318K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21318K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21318K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "The 355/400 kN ratings, 50.5 kN Pu and 6210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21318K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21318K?",
        "a": "21318K is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 43 mm width (3.543 × 7.48 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 355 kN, C0 400 kN, Pu 50.5 kN, grease limiting speed 2,300 r/min, oil 3,000 r/min, mass about 6210 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21318K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21318."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21318K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21318K?",
        "a": "21318K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21318K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 355 kN C / 400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21318-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21318-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21318k",
      "21318K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8420,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22318EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22318EAD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. 90 mm bore is 3.543 in and 190 mm OD is 7.48 in; the ISO 15 envelope swaps between brands, but the 668/652 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 90 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8420 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22318EAD1 by envelope alone: the 652 kN C0 and 40 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22318EAD1 by envelope alone: the 652 kN C0 and 40 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 668/652 kN ratings, 40 kN Pu and 8420 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EAD1?",
        "a": "22318EAD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8420 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22318EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22318EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22318EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318ead1",
      "＊22318ead1",
      "22318EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22318EAKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 90 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 90 mm bore assembly. Speed planning: 2,500 r/min grease limiting speed is the cage/kinematic ceiling and 3,000 r/min is the oil-lubricated value for the 90 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 90 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8250 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 668 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 22318EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×190 mm envelope is identical.",
      "The 668/652 kN ratings, 40 kN Pu and 8250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EAKD1?",
        "a": "22318EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8250 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22318EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22318EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22318EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318eakd1",
      "＊22318eakd1",
      "22318EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 90 mm shaft, NTN supplies 22318EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22318EMD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. With about 7.4 kN of C per millimetre of the 90 mm bore, 22318EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22318EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22318EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 668 kN rating no longer applies.",
      "The cylindrical-bore 22318EMD1 and its tapered-bore counterpart 22318EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 22318EMD1 by envelope alone: the 652 kN C0 and 40 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 668/652 kN ratings, 40 kN Pu and 8530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EMD1?",
        "a": "22318EMD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8530 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22318EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22318EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22318EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318emd1",
      "＊22318emd1",
      "22318EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22318EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22318EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 90,
    "D_mm": 190,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 668,
    "static_load_kN": 652,
    "fatigue_load_limit_kN": 40,
    "limiting_speed_rpm": 2500,
    "max_rpm": 2500,
    "speed_oil_rpm": 3000,
    "weight_g": 8350,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22318EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 90 mm shaft — 668 kN basic dynamic capacity in a 8350 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22318EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 0.98 (652/668 kN) reflects the heavy static and shock proportioning of 22318EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 90 mm ring with induction heat or the sleeve drive-up procedure; at 8350 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22318EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22318EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 90×190 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 90 mm bearing, and drive-up procedures differ.",
      "The 668/652 kN ratings, 40 kN Pu and 8350 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22318EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22318EMKD1?",
        "a": "22318EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 90 mm bore, 190 mm OD and 64 mm width (3.543 × 7.48 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 668 kN, C0 652 kN, Pu 40 kN, grease limiting speed 2,500 r/min, oil 3,000 r/min, mass about 8350 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22318EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22318EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22318EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22318EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22318EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22318EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 668 kN C / 652 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22318EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22318EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22318emkd1",
      "＊22318emkd1",
      "22318EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22219EAD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 95×170 mm envelope, EA names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 416 kN, C0 417 kN (C0/C ≈ 1.00), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 3980 g (3.98 kg) for the 95×170×43 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 22219EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 3980 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22219EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 22219EAD1 and its tapered-bore counterpart 22219EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 95 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 416/417 kN ratings, 33.4 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EAD1?",
        "a": "22219EAD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22219EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22219EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22219EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219ead1",
      "＊22219ead1",
      "22219EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22219EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 95 mm bore, 170 mm OD, 43 mm width, rated 3,000 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 95 mm bore; the 43 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. The 37.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 43 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 43 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 3900 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,800 r/min needs drain and level design; flooding the 43 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22219EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "Never substitute 22219EAKD1 by envelope alone: the 417 kN C0 and 33.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 416/417 kN ratings, 33.4 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EAKD1?",
        "a": "22219EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 3900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22219EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22219EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22219EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219eakd1",
      "＊22219eakd1",
      "22219EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 4060,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 95 mm shaft, NTN supplies 22219EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,800 r/min. Reading the full code: the number gives the 95×170 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 22219EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 3,000 r/min grease limiting speed is the cage/kinematic ceiling and 3,800 r/min is the oil-lubricated value for the 95 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22219EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 4060 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22219EMD1 by envelope alone: the 417 kN C0 and 33.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 416 kN rating no longer applies.",
      "The 416/417 kN ratings, 33.4 kN Pu and 4060 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EMD1?",
        "a": "22219EMD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 4060 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22219EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22219EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22219EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219emd1",
      "＊22219emd1",
      "22219EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22219EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22219EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 170,
    "B_mm": 43,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 416,
    "static_load_kN": 417,
    "fatigue_load_limit_kN": 33.4,
    "limiting_speed_rpm": 3000,
    "max_rpm": 3000,
    "speed_oil_rpm": 3800,
    "weight_g": 3980,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22219EMKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22219EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 95 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 37.5 mm radial section over the 95 mm bore carries two roller rows; capacity per millimetre of bore is about 4.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 3,000 r/min grease limiting speed is the cage/kinematic ceiling and 3,800 r/min is the oil-lubricated value for the 95 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 43 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 3980 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22219EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 43 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 3,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22219EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 416/417 kN ratings, 33.4 kN Pu and 3980 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22219EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22219EMKD1?",
        "a": "22219EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 170 mm OD and 43 mm width (3.74 × 6.693 × 1.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 416 kN, C0 417 kN, Pu 33.4 kN, grease limiting speed 3,000 r/min, oil 3,800 r/min, mass about 3980 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22219EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22219EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22219EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22219EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22219EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22219EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 416 kN C / 417 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22219EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22219EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=208",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22219emkd1",
      "＊22219emkd1",
      "22219EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21319-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21319",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 375,
    "static_load_kN": 420,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 7100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 95 mm shaft, NTN supplies 21319: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 2,700 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (C/CK), bore (cylindrical), lubrication feature (none); 21319 is assembled exactly in that order. The cylindrical bore fits a machined 95 mm shaft seat directly; the same envelope in 21319K (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 54 kN against C0 420 kN anchors the contamination derating; for dirty mining duty the adjusted life of 21319 moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 95 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 7100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 375 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21319 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 21319 carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The 375/420 kN ratings, 54 kN Pu and 7100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21319 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21319?",
        "a": "21319 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 375 kN, C0 420 kN, Pu 54 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 7100 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21319 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21319K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21319 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21319?",
        "a": "21319 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21319 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 375 kN C / 420 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21319",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21319-EK",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 95×200×45 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "21319K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21319K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21319",
      "21319-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21319K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21319K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 375,
    "static_load_kN": 420,
    "fatigue_load_limit_kN": 54,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 7000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21319K belongs to the 21300 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 95 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 45 mm width follow the general plan. Pu 54 kN is the catalogue fatigue load limit for 21319K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 52.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 45 mm-wide ring seats fully on both sides. Never mount 21319K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 200 mm race.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 7000 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 21319K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 21319K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 21319K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 375/420 kN ratings, 54 kN Pu and 7000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21319K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21319K?",
        "a": "21319K is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 45 mm width (3.74 × 7.874 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 375 kN, C0 420 kN, Pu 54 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 7000 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21319K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21319."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21319K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21319K?",
        "a": "21319K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21319K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 375 kN C / 420 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21319-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21319-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21319k",
      "21319K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 9910,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22319EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 95×200×67 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Numbering ties 22319EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 95 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The cylindrical bore fits a machined 95 mm shaft seat directly; the same envelope in 22319EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. With about 7.7 kN of C per millimetre of the 95 mm bore, 22319EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 95 mm set.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 9910 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22319EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 95 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 22319EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The 732/751 kN ratings, 43.4 kN Pu and 9910 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EAD1?",
        "a": "22319EAD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 9910 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22319EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22319EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22319EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319ead1",
      "＊22319ead1",
      "22319EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 9710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 95 mm shaft, NTN supplies 22319EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,800 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22319EAKD1 is assembled exactly in that order. At 732 kN C and 9710 g mass the 22300 series part is built for shock and vibration; the 67 mm-wide ring needs square abutments to keep both rows equally loaded. The 52.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 67 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 9710 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22319EAKD1 by envelope alone: the 751 kN C0 and 43.4 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22319EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 732/751 kN ratings, 43.4 kN Pu and 9710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EAKD1?",
        "a": "22319EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 9710 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22319EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22319EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22319EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319eakd1",
      "＊22319eakd1",
      "22319EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22319EMD1 identifies a 95×200×67 mm (3.74 × 7.874 × 2.638 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 95 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 67 mm width follow the general plan. The cylindrical bore fits a machined 95 mm shaft seat directly; the same envelope in 22319EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. 95 mm bore is 3.74 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 732/751 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22319EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 10000 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22319EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22319EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The 732/751 kN ratings, 43.4 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EMD1?",
        "a": "22319EMD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 10000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22319EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22319EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22319EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319emd1",
      "＊22319emd1",
      "22319EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22319EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22319EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 95,
    "D_mm": 200,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 732,
    "static_load_kN": 751,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2800,
    "weight_g": 9820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22319EMKD1 denotes the 95 mm bore spherical roller bearing (732 kN C / 751 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 95 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 67 mm width follow the general plan. Suffix reading on 22319EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 22319EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22319EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 200 mm race.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 95 mm ring with induction heat or the sleeve drive-up procedure; at 9820 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22319EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 95×200 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22319EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 732/751 kN ratings, 43.4 kN Pu and 9820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22319EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22319EMKD1?",
        "a": "22319EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 95 mm bore, 200 mm OD and 67 mm width (3.74 × 7.874 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 732 kN, C0 751 kN, Pu 43.4 kN, grease limiting speed 2,300 r/min, oil 2,800 r/min, mass about 9820 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22319EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22319EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22319EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22319EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22319EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22319EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 732 kN C / 751 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22319EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22319EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22319emkd1",
      "＊22319emkd1",
      "22319EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 464,
    "static_load_kN": 563,
    "fatigue_load_limit_kN": 30.7,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23120EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23120EAD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 4.6 kN of C per millimetre of the 100 mm bore, 23120EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 100 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4370 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23120EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23120EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23120EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 464/563 kN ratings, 30.7 kN Pu and 4370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EAD1?",
        "a": "23120EAD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 464 kN, C0 563 kN, Pu 30.7 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4370 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23120EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23120EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 464 kN C / 563 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23120EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120ead1",
      "＊23120ead1",
      "23120EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 464,
    "static_load_kN": 563,
    "fatigue_load_limit_kN": 30.7,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4240,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23120EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 100 mm bore, 165 mm OD, 52 mm width, rated 2,400 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23120EAKD1 is assembled exactly in that order. The 32.5 mm radial section over the 100 mm bore carries two roller rows; capacity per millimetre of bore is about 4.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 2,400 r/min grease limiting speed is the cage/kinematic ceiling and 3,000 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4240 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23120EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×165 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23120EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 464/563 kN ratings, 30.7 kN Pu and 4240 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EAKD1?",
        "a": "23120EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 464 kN, C0 563 kN, Pu 30.7 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4240 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23120EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23120EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 464 kN C / 563 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23120EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120eakd1",
      "＊23120eakd1",
      "23120EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 480,
    "static_load_kN": 590,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 23120EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,000 r/min. Numbering ties 23120EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 100 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 32.1 kN is the catalogue fatigue load limit for 23120EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 4.8 kN of C per millimetre of the 100 mm bore, 23120EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23120EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 165 mm race.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4450 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23120EMD1 and its tapered-bore counterpart 23120EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 480 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23120EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 480/590 kN ratings, 32.1 kN Pu and 4450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EMD1?",
        "a": "23120EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 480 kN, C0 590 kN, Pu 32.1 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4450 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23120EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23120EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 480 kN C / 590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23120EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120emd1",
      "＊23120emd1",
      "23120EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23120EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23120EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 165,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 480,
    "static_load_kN": 590,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 4320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23120EMKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 165 mm OD / 52 mm width follow the general plan. At 480 kN C and 4320 g mass the 23100 series part is built for shock and vibration; the 52 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 2,400 r/min grease limiting speed is the cage/kinematic ceiling and 3,000 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4320 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23120EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23120EMKD1 by envelope alone: the 590 kN C0 and 32.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23120EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 480/590 kN ratings, 32.1 kN Pu and 4320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23120EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23120EMKD1?",
        "a": "23120EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 165 mm OD and 52 mm width (3.937 × 6.496 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 480 kN, C0 590 kN, Pu 32.1 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 4320 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23120EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23120EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23120EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23120EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23120EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23120EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 480 kN C / 590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23120EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23120EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23120emkd1",
      "＊23120emkd1",
      "23120EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 4900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22220EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 100 mm shaft — 472 kN basic dynamic capacity in a 4900 g, open ISO 15 envelope. Numbering ties 22220EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 100 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 40.0 mm radial section over the 100 mm bore carries two roller rows; capacity per millimetre of bore is about 4.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Never mount 22220EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 180 mm race.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4900 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22220EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×180 mm envelope is identical.",
      "Never substitute 22220EAD1 by envelope alone: the 495 kN C0 and 36.9 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22220EAD1 and its tapered-bore counterpart 22220EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 472/495 kN ratings, 36.9 kN Pu and 4900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EAD1?",
        "a": "22220EAD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 4900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22220EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22220EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22220EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220ead1",
      "＊22220ead1",
      "22220EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 4800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22220EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 100 mm bore, 180 mm OD, 46 mm width, rated 2,800 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 100 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 472 kN C and 4800 g mass the 22200 series part is built for shock and vibration; the 46 mm-wide ring needs square abutments to keep both rows equally loaded. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Mount 22220EAKD1 on its adapter or withdrawal sleeve on the 100 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4800 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22220EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22220EAKD1 by envelope alone: the 495 kN C0 and 36.9 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 472/495 kN ratings, 36.9 kN Pu and 4800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EAKD1?",
        "a": "22220EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 4800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22220EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22220EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22220EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220eakd1",
      "＊22220eakd1",
      "22220EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 5020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22220EMD1 denotes the 100 mm bore spherical roller bearing (472 kN C / 495 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 46 mm width follow the general plan. The 40.0 mm radial section over the 100 mm bore carries two roller rows; capacity per millimetre of bore is about 4.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.05 (495/472 kN) reflects the heavy static and shock proportioning of 22220EMD1; size the equivalent load at the required L10 with shock factor for the application. Fit the cylindrical-bore 22220EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 5020 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 46 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "Never substitute 22220EMD1 by envelope alone: the 495 kN C0 and 36.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22220EMD1 and its tapered-bore counterpart 22220EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 472/495 kN ratings, 36.9 kN Pu and 5020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EMD1?",
        "a": "22220EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 5020 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22220EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22220EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22220EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220emd1",
      "＊22220emd1",
      "22220EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22220EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22220EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 472,
    "static_load_kN": 495,
    "fatigue_load_limit_kN": 36.9,
    "limiting_speed_rpm": 2800,
    "max_rpm": 2800,
    "speed_oil_rpm": 3600,
    "weight_g": 4930,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22220EMKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22220EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 100 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22220EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.05 (495/472 kN) reflects the heavy static and shock proportioning of 22220EMKD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 4930 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22220EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×180 mm envelope is identical.",
      "Oil relubrication toward 3,600 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 46 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 472/495 kN ratings, 36.9 kN Pu and 4930 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22220EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22220EMKD1?",
        "a": "22220EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 46 mm width (3.937 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 472 kN, C0 495 kN, Pu 36.9 kN, grease limiting speed 2,800 r/min, oil 3,600 r/min, mass about 4930 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22220EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22220EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22220EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22220EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22220EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22220EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 472 kN C / 495 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22220EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22220EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22220emkd1",
      "＊22220emkd1",
      "22220EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23220EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23220EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 60.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 586,
    "static_load_kN": 661,
    "fatigue_load_limit_kN": 36.3,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2900,
    "weight_g": 6510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23220EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 100 mm shaft — 586 kN basic dynamic capacity in a 6510 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 100 mm bore; the 60.3 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23220EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 2,300 r/min limiting value is .79 of the 2,900 r/min oil value; heavy 60.3 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 60.3 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 6510 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23220EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 23220EMD1 by envelope alone: the 661 kN C0 and 36.3 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60.3 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 586/661 kN ratings, 36.3 kN Pu and 6510 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23220EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23220EMD1?",
        "a": "23220EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 60.3 mm width (3.937 × 7.087 × 2.374 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 586 kN, C0 661 kN, Pu 36.3 kN, grease limiting speed 2,300 r/min, oil 2,900 r/min, mass about 6510 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23220EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23220EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23220EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23220EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23220EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23220EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 586 kN C / 661 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23220EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23220EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23220emd1",
      "＊23220emd1",
      "23220EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23220EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23220EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 180,
    "B_mm": 60.3,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 586,
    "static_load_kN": 661,
    "fatigue_load_limit_kN": 36.3,
    "limiting_speed_rpm": 2300,
    "max_rpm": 2300,
    "speed_oil_rpm": 2900,
    "weight_g": 6330,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23220EMKD1 denotes the 100 mm bore spherical roller bearing (586 kN C / 661 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 100×180 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.13 (661/586 kN) reflects the heavy static and shock proportioning of 23220EMKD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 100 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 6330 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23220EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×180 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23220EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The 586/661 kN ratings, 36.3 kN Pu and 6330 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23220EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23220EMKD1?",
        "a": "23220EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 180 mm OD and 60.3 mm width (3.937 × 7.087 × 2.374 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 586 kN, C0 661 kN, Pu 36.3 kN, grease limiting speed 2,300 r/min, oil 2,900 r/min, mass about 6330 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23220EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23220EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23220EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23220EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23220EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23220EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 586 kN C / 661 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23220EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23220EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23220emkd1",
      "＊23220emkd1",
      "23220EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21320-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21320",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 410,
    "static_load_kN": 465,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2600,
    "weight_g": 8890,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21320 is the C design-code execution of NTN's spherical roller range for a 100 mm shaft — 410 kN basic dynamic capacity in a 8890 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (21300 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 215 mm OD / 47 mm width follow the general plan. Suffix reading on 21320: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 21320; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 21320 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 215 mm race.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 8890 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 21320 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 21320 by envelope alone: the 465 kN C0 and 42.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 47 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 410/465 kN ratings, 42.5 kN Pu and 8890 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21320 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21320?",
        "a": "21320 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 465 kN, Pu 42.5 kN, grease limiting speed 2,000 r/min, oil 2,600 r/min, mass about 8890 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21320 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21320K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21320 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21320?",
        "a": "21320 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21320 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 410 kN C / 465 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21320",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21320-EK",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21320K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21320K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21320",
      "21320-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21320K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21320K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 47,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 410,
    "static_load_kN": 465,
    "fatigue_load_limit_kN": 42.5,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2600,
    "weight_g": 8780,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 21320K: sphered outer raceway, two roller rows, pressed-steel cage of the 213-series C design, oil speed 2,600 r/min. Reading the full code: the number gives the 100×215 mm envelope, C/CK names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 100 mm bore assembly. Speed planning: 2,000 r/min grease limiting speed is the cage/kinematic ceiling and 2,600 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 21320K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 215 mm race.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 8780 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "213-series C/CK executions use the C cage/design code — CK adds the 1:12 tapered bore; quote 21320K in full because a C cannot be mounted on an adapter-sleeve tapered seat.",
      "Never substitute 21320K by envelope alone: the 465 kN C0 and 42.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 21320K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×215 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 21320K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 100×215 mm envelope is identical.",
      "The 410/465 kN ratings, 42.5 kN Pu and 8780 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21320K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21320K?",
        "a": "21320K is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 47 mm width (3.937 × 8.465 × 1.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 410 kN, C0 465 kN, Pu 42.5 kN, grease limiting speed 2,000 r/min, oil 2,600 r/min, mass about 8780 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21320K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21320."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21320K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21320K?",
        "a": "21320K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21320K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 410 kN C / 465 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21320-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21320-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21320k",
      "21320K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 22320EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 100 mm bore; the 73 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 2,100 r/min grease limiting speed is the cage/kinematic ceiling and 2,600 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 22320EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 215 mm race.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12600 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 73 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 73 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 22320EAD1 and its tapered-bore counterpart 22320EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22320EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EAD1?",
        "a": "22320EAD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22320EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22320EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22320EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320ead1",
      "＊22320ead1",
      "22320EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 100 mm shaft, NTN supplies 22320EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,600 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22320EAKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22320EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 73 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12300 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 827 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 827 kN rating no longer applies.",
      "Never substitute 22320EAKD1 by envelope alone: the 844 kN C0 and 50.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EAKD1?",
        "a": "22320EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22320EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22320EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22320EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320eakd1",
      "＊22320eakd1",
      "22320EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22320EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 100 mm bore, 215 mm OD, 73 mm width, rated 2,100 r/min on grease. Reading the full code: the number gives the 100×215 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Pu 50.1 kN is the catalogue fatigue load limit for 22320EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 2,100 r/min grease limiting speed is the cage/kinematic ceiling and 2,600 r/min is the oil-lubricated value for the 100 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 100 mm set.",
    "applications": [
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12900 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 100 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 827 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 73 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22320EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EMD1?",
        "a": "22320EMD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22320EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22320EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22320EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320emd1",
      "＊22320emd1",
      "22320EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22320EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22320EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 100,
    "D_mm": 215,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 827,
    "static_load_kN": 844,
    "fatigue_load_limit_kN": 50.1,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 12700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22320EMKD1 denotes the 100 mm bore spherical roller bearing (827 kN C / 844 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 100 mm (two-digit code ×5, with the 00–03 exception table), and 215 mm OD / 73 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22320EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 73 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 100 mm ring with induction heat or the sleeve drive-up procedure; at 12700 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22320EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22320EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 100 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22320EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 827/844 kN ratings, 50.1 kN Pu and 12700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22320EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22320EMKD1?",
        "a": "22320EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 100 mm bore, 215 mm OD and 73 mm width (3.937 × 8.465 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 827 kN, C0 844 kN, Pu 50.1 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 12700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22320EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22320EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22320EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22320EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22320EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22320EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 827 kN C / 844 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22320EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22320EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22320emkd1",
      "＊22320emkd1",
      "22320EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3660,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23022EAD1 identifies a 110×170×45 mm (4.331 × 6.693 × 1.772 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23022EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23022EAD1: 2,600 r/min grease and 3,300 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Pu 32.1 kN against C0 517 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23022EAD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 110 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3660 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 23022EAD1 by envelope alone: the 517 kN C0 and 32.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23022EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23022EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×170 mm envelope is identical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 45 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EAD1?",
        "a": "23022EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3660 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23022EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23022EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23022EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022ead1",
      "＊23022ead1",
      "23022EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23022EAKD1 identifies a 110×170×45 mm (4.331 × 6.693 × 1.772 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 45 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 110 mm bore assembly. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,300 r/min is the oil-lubricated value for the 110 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23022EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3550 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23022EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23022EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23022EAKD1 by envelope alone: the 517 kN C0 and 32.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23022EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×170 mm envelope is identical.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EAKD1?",
        "a": "23022EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3550 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23022EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23022EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23022EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022eakd1",
      "＊23022eakd1",
      "23022EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3660,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23022EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 110 mm shaft — 417 kN basic dynamic capacity in a 3660 g, open ISO 15 envelope. Numbering ties 23022EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23022EMD1: 2,600 r/min grease and 3,300 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Speed planning: 2,600 r/min grease limiting speed is the cage/kinematic ceiling and 3,300 r/min is the oil-lubricated value for the 110 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23022EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3660 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 23022EMD1 and its tapered-bore counterpart 23022EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 45 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EMD1?",
        "a": "23022EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3660 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23022EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23022EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23022EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022emd1",
      "＊23022emd1",
      "23022EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23022EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23022EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 170,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 417,
    "static_load_kN": 517,
    "fatigue_load_limit_kN": 32.1,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 3550,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23022EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 110 mm bore, 170 mm OD, 45 mm width, rated 2,600 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23022EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.24 (517/417 kN) reflects the heavy static and shock proportioning of 23022EMKD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 45 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 3550 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 417 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 45 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The 417/517 kN ratings, 32.1 kN Pu and 3550 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23022EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23022EMKD1?",
        "a": "23022EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 170 mm OD and 45 mm width (4.331 × 6.693 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 417 kN, C0 517 kN, Pu 32.1 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 3550 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23022EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23022EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23022EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23022EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23022EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23022EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 417 kN C / 517 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23022EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23022EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23022emkd1",
      "＊23022emkd1",
      "23022EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5660,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23122EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 56 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23122EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. With about 5.0 kN of C per millimetre of the 110 mm bore, 23122EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 110 mm set.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5660 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The cylindrical-bore 23122EAD1 and its tapered-bore counterpart 23122EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 23122EAD1 by envelope alone: the 669 kN C0 and 36.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5660 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EAD1?",
        "a": "23122EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5660 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23122EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23122EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23122EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122ead1",
      "＊23122ead1",
      "23122EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23122EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 110×180×56 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23122EAKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Selection: the C0/C ratio of 1.22 (669/547 kN) reflects the heavy static and shock proportioning of 23122EAKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5490 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23122EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 56 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23122EAKD1 by envelope alone: the 669 kN C0 and 36.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23122EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5490 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EAKD1?",
        "a": "23122EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5490 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23122EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23122EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23122EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122eakd1",
      "＊23122eakd1",
      "23122EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5530,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 23122EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,800 r/min. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 56 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 36.2 kN against C0 669 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23122EMD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 56 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5530 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 23122EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×180 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5530 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EMD1?",
        "a": "23122EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5530 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23122EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23122EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23122EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122emd1",
      "＊23122emd1",
      "23122EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23122EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23122EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 547,
    "static_load_kN": 669,
    "fatigue_load_limit_kN": 36.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 5360,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 23122EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,800 r/min. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 110 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 56 mm width follow the general plan. Pu 36.2 kN is the catalogue fatigue load limit for 23122EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Selection: the C0/C ratio of 1.22 (669/547 kN) reflects the heavy static and shock proportioning of 23122EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 5360 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 56 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23122EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23122EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 547/669 kN ratings, 36.2 kN Pu and 5360 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23122EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23122EMKD1?",
        "a": "23122EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 56 mm width (4.331 × 7.087 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 547 kN, C0 669 kN, Pu 36.2 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 5360 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23122EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23122EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23122EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23122EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23122EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23122EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 547 kN C / 669 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23122EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23122EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23122emkd1",
      "＊23122emkd1",
      "23122EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24122EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24122EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 622,
    "static_load_kN": 769,
    "fatigue_load_limit_kN": 35.7,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2700,
    "weight_g": 6750,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24122EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24122EMD1 is assembled exactly in that order. Pu 35.7 kN is the catalogue fatigue load limit for 24122EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 35.7 kN against C0 769 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24122EMD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 6750 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24122EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24122EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 622/769 kN ratings, 35.7 kN Pu and 6750 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24122EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24122EMD1?",
        "a": "24122EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 69 mm width (4.331 × 7.087 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 622 kN, C0 769 kN, Pu 35.7 kN, grease limiting speed 2,200 r/min, oil 2,700 r/min, mass about 6750 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24122EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24122EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24122EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24122EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24122EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24122EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 622 kN C / 769 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24122EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24122EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24122emd1",
      "＊24122emd1",
      "24122EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24122EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24122EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 180,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 622,
    "static_load_kN": 769,
    "fatigue_load_limit_kN": 35.7,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2700,
    "weight_g": 6650,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24122EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 110 mm bore, 180 mm OD, 69 mm width, rated 2,200 r/min on grease. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 110 mm (two-digit code ×5, with the 00–03 exception table), and 180 mm OD / 69 mm width follow the general plan. At 622 kN C and 6650 g mass the 24100 series part is built for shock and vibration; the 69 mm-wide ring needs square abutments to keep both rows equally loaded. The 35.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 69 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 69 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 6650 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Oil relubrication toward 2,700 r/min needs drain and level design; flooding the 69 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 24122EMK30D1 by envelope alone: the 769 kN C0 and 35.7 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24122EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 622/769 kN ratings, 35.7 kN Pu and 6650 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24122EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24122EMK30D1?",
        "a": "24122EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 180 mm OD and 69 mm width (4.331 × 7.087 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 622 kN, C0 769 kN, Pu 35.7 kN, grease limiting speed 2,200 r/min, oil 2,700 r/min, mass about 6650 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24122EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 110 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24122EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24122EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24122EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24122EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24122EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 622 kN C / 769 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24122EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24122EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24122emk30d1",
      "＊24122emk30d1",
      "24122EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 7100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22222EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 110 mm shaft — 602 kN basic dynamic capacity in a 7100 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22222EAD1: 2,600 r/min grease and 3,300 r/min oil — the gap of 700 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 2,600 r/min limiting value is .79 of the 3,300 r/min oil value; heavy 53 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 53 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 7100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The cylindrical-bore 22222EAD1 and its tapered-bore counterpart 22222EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 53 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 602 kN rating no longer applies.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 602/643 kN ratings, 45 kN Pu and 7100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EAD1?",
        "a": "22222EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 7100 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22222EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22222EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22222EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222ead1",
      "＊22222ead1",
      "22222EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 6950,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22222EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 110×200×53 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 110 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 45 kN is the catalogue fatigue load limit for 22222EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 22222EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 110 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 6950 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 22222EAKD1 by envelope alone: the 643 kN C0 and 45 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22222EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22222EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 602/643 kN ratings, 45 kN Pu and 6950 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EAKD1?",
        "a": "22222EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 6950 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22222EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22222EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22222EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222eakd1",
      "＊22222eakd1",
      "22222EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 7300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22222EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 110 mm shaft — 602 kN basic dynamic capacity in a 7300 g, open ISO 15 envelope. Reading the full code: the number gives the 110×200 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Pu 45 kN is the catalogue fatigue load limit for 22222EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 22222EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 22222EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 7300 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22222EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22222EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 602/643 kN ratings, 45 kN Pu and 7300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EMD1?",
        "a": "22222EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 7300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22222EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22222EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22222EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222emd1",
      "＊22222emd1",
      "22222EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22222EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22222EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 602,
    "static_load_kN": 643,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 2600,
    "max_rpm": 2600,
    "speed_oil_rpm": 3300,
    "weight_g": 7150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 22222EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,300 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22222EMKD1 is assembled exactly in that order. Open by design, 22222EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 2,600 r/min limiting value is .79 of the 3,300 r/min oil value; heavy 53 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 7150 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22222EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×200 mm envelope is identical.",
      "Oil relubrication toward 3,300 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22222EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 602 kN rating no longer applies.",
      "The 602/643 kN ratings, 45 kN Pu and 7150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22222EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22222EMKD1?",
        "a": "22222EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 53 mm width (4.331 × 7.874 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 602 kN, C0 643 kN, Pu 45 kN, grease limiting speed 2,600 r/min, oil 3,300 r/min, mass about 7150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22222EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22222EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22222EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22222EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22222EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22222EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 602 kN C / 643 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22222EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22222EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22222emkd1",
      "＊22222emkd1",
      "22222EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23222EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23222EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 69.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 752,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 43.9,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 9410,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23222EMD1 identifies a 110×200×69.8 mm (4.331 × 7.874 × 2.748 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23222EMD1 is assembled exactly in that order. NTN prints two speeds for 23222EMD1: 2,100 r/min grease and 2,600 r/min oil — the gap of 500 r/min reflects oil cooling of the heavy roller set. With about 6.8 kN of C per millimetre of the 110 mm bore, 23222EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 69.8 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 9410 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69.8 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 752 kN rating no longer applies.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 752/869 kN ratings, 43.9 kN Pu and 9410 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23222EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23222EMD1?",
        "a": "23222EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 69.8 mm width (4.331 × 7.874 × 2.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 752 kN, C0 869 kN, Pu 43.9 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 9410 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23222EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23222EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23222EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23222EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23222EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23222EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 752 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23222EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23222EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23222emd1",
      "＊23222emd1",
      "23222EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23222EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23222EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 200,
    "B_mm": 69.8,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 752,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 43.9,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 9140,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23222EMKD1 belongs to the 23200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 110×200 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23222EMKD1: 2,100 r/min grease and 2,600 r/min oil — the gap of 500 r/min reflects oil cooling of the heavy roller set. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 69.8 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 110 mm set.",
    "applications": [
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 9140 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 23222EMKD1 by envelope alone: the 869 kN C0 and 43.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 2,600 r/min needs drain and level design; flooding the 69.8 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 752/869 kN ratings, 43.9 kN Pu and 9140 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23222EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23222EMKD1?",
        "a": "23222EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 200 mm OD and 69.8 mm width (4.331 × 7.874 × 2.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 752 kN, C0 869 kN, Pu 43.9 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 9140 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23222EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23222EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23222EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23222EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23222EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23222EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 752 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23222EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23222EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23222emkd1",
      "＊23222emkd1",
      "23222EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21322-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21322",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 615,
    "fatigue_load_limit_kN": 61.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 11200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21322 is the C design-code execution of NTN's spherical roller range for a 110 mm shaft — 550 kN basic dynamic capacity in a 11200 g, open ISO 15 envelope. Reading the full code: the number gives the 110×240 mm envelope, C/CK names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. At 550 kN C and 11200 g mass the 21300 series part is built for shock and vibration; the 50 mm-wide ring needs square abutments to keep both rows equally loaded. 110 mm bore is 4.331 in and 240 mm OD is 9.449 in; the ISO 15 envelope swaps between brands, but the 550/615 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 50 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls",
      "cement-mill and kiln auxiliary drives",
      "large gearbox and marine gear shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 11200 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 550/615 kN ratings, 61.5 kN Pu and 11200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21322 (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21322?",
        "a": "21322 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 615 kN, Pu 61.5 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 11200 g. It is open, with pressed-steel cage of the 213-series C design."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "21322 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 21322K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21322 is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21322?",
        "a": "21322 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21322 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 550 kN C / 615 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21322",
        "equiv_brand": "FAG",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "21322K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 21322K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21322",
      "21322-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "21322K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 21322K",
    "series": "21300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 50,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 550,
    "static_load_kN": 615,
    "fatigue_load_limit_kN": 61.5,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 11100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "21322K is the C design-code execution of NTN's spherical roller range for a 110 mm shaft — 550 kN basic dynamic capacity in a 11100 g, open ISO 15 envelope. Numbering ties 21322K to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 21322K: C is the cage/design code for the NTN 213 series, CK adding the tapered bore; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. Catalogue mass 11100 g (11.10 kg) for the 110×240×50 mm execution includes the C design-code cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 21322K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 11100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Never substitute 21322K by envelope alone: the 615 kN C0 and 61.5 kN Pu are specific to the NTN C design-code execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 21322K carries C design-code; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×240 mm envelope is identical.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 50 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 50 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 550/615 kN ratings, 61.5 kN Pu and 11100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 21322K (C design-code); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 21322K?",
        "a": "21322K is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 50 mm width (4.331 × 9.449 × 1.969 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 550 kN, C0 615 kN, Pu 61.5 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 11100 g. It is open, with pressed-steel cage of the 213-series C design and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 21322K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 21322."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 21322K is the C design-code execution."
      },
      {
        "q": "What do D1 and W33 mean on 21322K?",
        "a": "21322K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 21322K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 21300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 550 kN C / 615 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "21322-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 21300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 21322-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "21322k",
      "21322K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 110 mm shaft, NTN supplies 22322EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,400 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22322EAD1 is assembled exactly in that order. Suffix reading on 22322EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 80 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 80 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 17000 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 110 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22322EAD1 by envelope alone: the 972 kN C0 and 59 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 975/972 kN ratings, 59 kN Pu and 17000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EAD1?",
        "a": "22322EAD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17000 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22322EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22322EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22322EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322ead1",
      "＊22322ead1",
      "22322EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 16600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22322EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 110 mm bore, 240 mm OD, 80 mm width, rated 2,000 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22322EAKD1 is assembled exactly in that order. NTN prints two speeds for 22322EAKD1: 2,000 r/min grease and 2,400 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 2,000 r/min limiting value is .83 of the 2,400 r/min oil value; heavy 80 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22322EAKD1 on its adapter or withdrawal sleeve on the 110 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions",
      "paper-machine dryer and press rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 16600 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22322EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22322EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 975/972 kN ratings, 59 kN Pu and 16600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EAKD1?",
        "a": "22322EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 16600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22322EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22322EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22322EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322eakd1",
      "＊22322eakd1",
      "22322EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22322EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 110 mm bore, 240 mm OD, 80 mm width, rated 2,000 r/min on grease. Numbering ties 22322EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 110 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 80 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large gearbox and marine gear shafts",
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 17400 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "Do not confuse EA and EM at the same number: 22322EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×240 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22322EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 110×240 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 110 mm bearing, and drive-up procedures differ.",
      "The 975/972 kN ratings, 59 kN Pu and 17400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EMD1?",
        "a": "22322EMD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22322EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22322EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22322EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322emd1",
      "＊22322emd1",
      "22322EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22322EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22322EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 110,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 975,
    "static_load_kN": 972,
    "fatigue_load_limit_kN": 59,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2400,
    "weight_g": 17100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22322EMKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 110 mm (two-digit code ×5, with the 00–03 exception table), and 240 mm OD / 80 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Grease/oil ratio: the 2,000 r/min limiting value is .83 of the 2,400 r/min oil value; heavy 80 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 22322EMKD1 on its adapter or withdrawal sleeve on the 110 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "wind-turbine gearbox and rotor bearings",
      "large vibrating screens and mining feeders",
      "heavy conveyor and bucket-excavator pulleys",
      "jaw/cone crusher eccentric and shaft positions"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "Mount the 110 mm ring with induction heat or the sleeve drive-up procedure; at 17100 g cocking damages the spherical raceways, and repositioning after seating is impractical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22322EMKD1 by envelope alone: the 972 kN C0 and 59 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 975/972 kN ratings, 59 kN Pu and 17100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22322EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22322EMKD1?",
        "a": "22322EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 110 mm bore, 240 mm OD and 80 mm width (4.331 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 975 kN, C0 972 kN, Pu 59 kN, grease limiting speed 2,000 r/min, oil 2,400 r/min, mass about 17100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22322EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22322EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22322EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22322EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22322EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22322EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 975 kN C / 972 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22322EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22322EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22322emkd1",
      "＊22322emkd1",
      "22322EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 4020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23024EAD1 identifies a 120×180×46 mm (4.724 × 7.087 × 1.811 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 446 kN, C0 577 kN (C0/C ≈ 1.29), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.29 (577/446 kN) reflects the heavy static and shock proportioning of 23024EAD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 446 kN rating no longer applies.",
      "Never substitute 23024EAD1 by envelope alone: the 577 kN C0 and 35.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 446/577 kN ratings, 35.8 kN Pu and 4020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EAD1?",
        "a": "23024EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 4020 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23024EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23024EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23024EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024ead1",
      "＊23024ead1",
      "23024EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23024EAKD1 identifies a 120×180×46 mm (4.724 × 7.087 × 1.811 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 46 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 446 kN rating no longer applies.",
      "Never substitute 23024EAKD1 by envelope alone: the 577 kN C0 and 35.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 446 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23024EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 446/577 kN ratings, 35.8 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EAKD1?",
        "a": "23024EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 3900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23024EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23024EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23024EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024eakd1",
      "＊23024eakd1",
      "23024EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 4020,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23024EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 120 mm shaft — 446 kN basic dynamic capacity in a 4020 g, open ISO 15 envelope. Reading the full code: the number gives the 120×180 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 446 kN, C0 577 kN (C0/C ≈ 1.29), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 2,400 r/min grease limiting speed is the cage/kinematic ceiling and 3,100 r/min is the oil-lubricated value for the 120 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23024EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 180 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 3,100 r/min needs drain and level design; flooding the 46 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23024EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×180 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 446/577 kN ratings, 35.8 kN Pu and 4020 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EMD1?",
        "a": "23024EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 4020 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23024EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23024EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23024EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024emd1",
      "＊23024emd1",
      "23024EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23024EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23024EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 46,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 446,
    "static_load_kN": 577,
    "fatigue_load_limit_kN": 35.8,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3100,
    "weight_g": 3900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23024EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 120 mm bore, 180 mm OD, 46 mm width, rated 2,400 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23024EMKD1 is assembled exactly in that order. Pu 35.8 kN is the catalogue fatigue load limit for 23024EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 46 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 46 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 120 mm bore 23024EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23024EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23024EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23024EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 446/577 kN ratings, 35.8 kN Pu and 3900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23024EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23024EMKD1?",
        "a": "23024EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 46 mm width (4.724 × 7.087 × 1.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 446 kN, C0 577 kN, Pu 35.8 kN, grease limiting speed 2,400 r/min, oil 3,100 r/min, mass about 3900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23024EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23024EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23024EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23024EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23024EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23024EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 446 kN C / 577 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23024EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23024EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23024emkd1",
      "＊23024emkd1",
      "23024EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24024EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24024EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 526,
    "static_load_kN": 726,
    "fatigue_load_limit_kN": 34.4,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 5280,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24024EMD1 identifies a 120×180×60 mm (4.724 × 7.087 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24024EMD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 24024EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24024EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 120 mm bore 24024EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24024EMD1 and its tapered-bore counterpart 24024EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 24024EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×180 mm envelope is identical.",
      "Never substitute 24024EMD1 by envelope alone: the 726 kN C0 and 34.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 526/726 kN ratings, 34.4 kN Pu and 5280 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24024EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24024EMD1?",
        "a": "24024EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 60 mm width (4.724 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 526 kN, C0 726 kN, Pu 34.4 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 5280 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24024EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24024EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24024EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24024EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24024EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24024EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 526 kN C / 726 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24024EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24024EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24024emd1",
      "＊24024emd1",
      "24024EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24024EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24024EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 180,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 526,
    "static_load_kN": 726,
    "fatigue_load_limit_kN": 34.4,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2600,
    "weight_g": 5210,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24024EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 120 mm bore, 180 mm OD, 60 mm width, rated 2,100 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 34.4 kN is the catalogue fatigue load limit for 24024EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 60 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 24024EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24024EMK30D1 by envelope alone: the 726 kN C0 and 34.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24024EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×180 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24024EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 526/726 kN ratings, 34.4 kN Pu and 5210 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24024EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24024EMK30D1?",
        "a": "24024EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 180 mm OD and 60 mm width (4.724 × 7.087 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 526 kN, C0 726 kN, Pu 34.4 kN, grease limiting speed 2,100 r/min, oil 2,600 r/min, mass about 5210 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24024EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 120 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24024EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24024EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24024EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24024EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24024EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 526 kN C / 726 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24024EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24024EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24024emk30d1",
      "＊24024emk30d1",
      "24024EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7720,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23124EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23124EAD1 is assembled exactly in that order. At 663 kN C and 7720 g mass the 23100 series part is built for shock and vibration; the 62 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 43.4 kN against C0 820 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23124EAD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 62 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 62 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 62 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7720 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EAD1?",
        "a": "23124EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7720 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23124EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23124EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23124EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124ead1",
      "＊23124ead1",
      "23124EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7490,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23124EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 120×200×62 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23124EAKD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 663 kN, C0 820 kN (C0/C ≈ 1.24), with useful axial capacity in either direction alongside the dominant radial load. The 40.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 62 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 62 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23124EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×200 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23124EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7490 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EAKD1?",
        "a": "23124EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7490 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23124EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23124EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23124EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124eakd1",
      "＊23124eakd1",
      "23124EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7770,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 23124EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,500 r/min. Numbering ties 23124EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 120 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The cylindrical bore fits a machined 120 mm shaft seat directly; the same envelope in 23124EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 43.4 kN against C0 820 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23124EMD1 moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 23124EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23124EMD1 by envelope alone: the 820 kN C0 and 43.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 663 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23124EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23124EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×200 mm envelope is identical.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7770 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EMD1?",
        "a": "23124EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7770 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23124EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23124EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23124EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124emd1",
      "＊23124emd1",
      "23124EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23124EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23124EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 62,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 663,
    "static_load_kN": 820,
    "fatigue_load_limit_kN": 43.4,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7540,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23124EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 120 mm bore, 200 mm OD, 62 mm width, rated 2,000 r/min on grease. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 120 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 62 mm width follow the general plan. At 663 kN C and 7540 g mass the 23100 series part is built for shock and vibration; the 62 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23124EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 62 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 120 mm bore 23124EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23124EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×200 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23124EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 663/820 kN ratings, 43.4 kN Pu and 7540 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23124EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23124EMKD1?",
        "a": "23124EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 62 mm width (4.724 × 7.874 × 2.441 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 663 kN, C0 820 kN, Pu 43.4 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7540 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23124EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23124EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23124EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23124EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23124EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23124EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 663 kN C / 820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23124EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23124EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23124emkd1",
      "＊23124emkd1",
      "23124EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24124EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24124EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 756,
    "static_load_kN": 991,
    "fatigue_load_limit_kN": 41.3,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2500,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24124EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 120 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 80 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.31 (991/756 kN) reflects the heavy static and shock proportioning of 24124EMD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24124EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 120 mm bore 24124EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 24124EMD1 and its tapered-bore counterpart 24124EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "The 756/991 kN ratings, 41.3 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24124EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24124EMD1?",
        "a": "24124EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 80 mm width (4.724 × 7.874 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 756 kN, C0 991 kN, Pu 41.3 kN, grease limiting speed 1,900 r/min, oil 2,500 r/min, mass about 10000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24124EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24124EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24124EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24124EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24124EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24124EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 756 kN C / 991 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24124EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24124EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24124emd1",
      "＊24124emd1",
      "24124EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24124EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24124EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 200,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 756,
    "static_load_kN": 991,
    "fatigue_load_limit_kN": 41.3,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2500,
    "weight_g": 9870,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24124EMK30D1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24124EMK30D1 is assembled exactly in that order. Pu 41.3 kN is the catalogue fatigue load limit for 24124EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 120 mm bore is 4.724 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 756/991 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 120 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 120 mm bore 24124EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24124EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24124EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 756/991 kN ratings, 41.3 kN Pu and 9870 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24124EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24124EMK30D1?",
        "a": "24124EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 200 mm OD and 80 mm width (4.724 × 7.874 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 756 kN, C0 991 kN, Pu 41.3 kN, grease limiting speed 1,900 r/min, oil 2,500 r/min, mass about 9870 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24124EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 120 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24124EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24124EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24124EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24124EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24124EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 756 kN C / 991 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24124EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24124EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24124emk30d1",
      "＊24124emk30d1",
      "24124EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 8880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22224EAD1 identifies a 120×215×58 mm (4.724 × 8.465 × 2.283 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22224EAD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 5.7 kN of C per millimetre of the 120 mm bore, 22224EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 58 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 3,000 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "The 688/753 kN ratings, 49.9 kN Pu and 8880 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EAD1?",
        "a": "22224EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 8880 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22224EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22224EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22224EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224ead1",
      "＊22224ead1",
      "22224EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 8680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22224EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 120×215×58 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 58 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22224EAKD1: 2,400 r/min grease and 3,000 r/min oil — the gap of 600 r/min reflects oil cooling of the heavy roller set. 120 mm bore is 4.724 in and 215 mm OD is 8.465 in; the ISO 15 envelope swaps between brands, but the 688/753 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22224EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×215 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22224EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 120 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 3,000 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 688/753 kN ratings, 49.9 kN Pu and 8680 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EAKD1?",
        "a": "22224EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 8680 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22224EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22224EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22224EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224eakd1",
      "＊22224eakd1",
      "22224EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 9010,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22224EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 120 mm shaft — 688 kN basic dynamic capacity in a 9010 g, open ISO 15 envelope. Numbering ties 22224EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 120 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 5.7 kN of C per millimetre of the 120 mm bore, 22224EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22224EMD1 by envelope alone: the 753 kN C0 and 49.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 3,000 r/min needs drain and level design; flooding the 58 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22224EMD1 by envelope alone: the 753 kN C0 and 49.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22224EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 688/753 kN ratings, 49.9 kN Pu and 9010 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EMD1?",
        "a": "22224EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 9010 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22224EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22224EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22224EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224emd1",
      "＊22224emd1",
      "22224EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22224EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22224EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 58,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 688,
    "static_load_kN": 753,
    "fatigue_load_limit_kN": 49.9,
    "limiting_speed_rpm": 2400,
    "max_rpm": 2400,
    "speed_oil_rpm": 3000,
    "weight_g": 8820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 22224EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 3,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22224EMKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. 120 mm bore is 4.724 in and 215 mm OD is 8.465 in; the ISO 15 envelope swaps between brands, but the 688/753 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 22224EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22224EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22224EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×215 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22224EMKD1 by envelope alone: the 753 kN C0 and 49.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 688/753 kN ratings, 49.9 kN Pu and 8820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22224EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22224EMKD1?",
        "a": "22224EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 58 mm width (4.724 × 8.465 × 2.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 688 kN, C0 753 kN, Pu 49.9 kN, grease limiting speed 2,400 r/min, oil 3,000 r/min, mass about 8820 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22224EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22224EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22224EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22224EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22224EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22224EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 688 kN C / 753 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22224EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22224EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22224emkd1",
      "＊22224emkd1",
      "22224EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23224EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23224EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 76,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 857,
    "static_load_kN": 998,
    "fatigue_load_limit_kN": 49.8,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 11700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23224EMD1 identifies a 120×215×76 mm (4.724 × 8.465 × 2.992 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 76 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 857 kN, C0 998 kN (C0/C ≈ 1.16), with useful axial capacity in either direction alongside the dominant radial load. With about 7.1 kN of C per millimetre of the 120 mm bore, 23224EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 23224EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 120 mm bore 23224EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23224EMD1 and its tapered-bore counterpart 23224EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 857 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 120 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 857/998 kN ratings, 49.8 kN Pu and 11700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23224EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23224EMD1?",
        "a": "23224EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 76 mm width (4.724 × 8.465 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 857 kN, C0 998 kN, Pu 49.8 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 11700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23224EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23224EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23224EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23224EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23224EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23224EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 857 kN C / 998 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23224EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23224EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23224emd1",
      "＊23224emd1",
      "23224EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23224EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23224EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 215,
    "B_mm": 76,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 857,
    "static_load_kN": 998,
    "fatigue_load_limit_kN": 49.8,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 11300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 23224EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 76 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23224EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 120 mm bore is 4.724 in and 215 mm OD is 8.465 in; the ISO 15 envelope swaps between brands, but the 857/998 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 23224EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 76 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23224EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 76 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 76 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 857/998 kN ratings, 49.8 kN Pu and 11300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23224EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23224EMKD1?",
        "a": "23224EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 215 mm OD and 76 mm width (4.724 × 8.465 × 2.992 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 857 kN, C0 998 kN, Pu 49.8 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 11300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23224EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23224EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23224EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23224EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23224EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23224EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 857 kN C / 998 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23224EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23224EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23224emkd1",
      "＊23224emkd1",
      "23224EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 22300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 120 mm shaft, NTN supplies 22324EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,200 r/min. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1170 kN C and 22300 g mass the 22300 series part is built for shock and vibration; the 86 mm-wide ring needs square abutments to keep both rows equally loaded. The 70.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 86 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 22324EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 22324EAD1 and its tapered-bore counterpart 22324EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 22300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EAD1?",
        "a": "22324EAD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 22300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22324EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22324EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22324EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324ead1",
      "＊22324ead1",
      "22324EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 21900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22324EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 120 mm bore, 260 mm OD, 86 mm width, rated 1,800 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22324EAKD1 is assembled exactly in that order. The 70.0 mm radial section over the 120 mm bore carries two roller rows; capacity per millimetre of bore is about 9.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 120 mm bore is 4.724 in and 260 mm OD is 10.236 in; the ISO 15 envelope swaps between brands, but the 1170/1280 kN ratings and cage design are NTN 2203E values. Mount 22324EAKD1 on its adapter or withdrawal sleeve on the 120 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1170 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22324EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×260 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22324EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 21900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EAKD1?",
        "a": "22324EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 21900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22324EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22324EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22324EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324eakd1",
      "＊22324eakd1",
      "22324EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 22700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22324EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 120 mm bore, 260 mm OD, 86 mm width, rated 1,800 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 120 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 120 mm shaft seat directly; the same envelope in 22324EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Grease/oil ratio: the 1,800 r/min limiting value is .82 of the 2,200 r/min oil value; heavy 86 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22324EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 22324EMD1 and its tapered-bore counterpart 22324EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22324EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22324EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×260 mm envelope is identical.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 22700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EMD1?",
        "a": "22324EMD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 22700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22324EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22324EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22324EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324emd1",
      "＊22324emd1",
      "22324EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22324EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22324EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 120,
    "D_mm": 260,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1170,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 68.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 22200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22324EMKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 120 mm (two-digit code ×5, with the 00–03 exception table), and 260 mm OD / 86 mm width follow the general plan. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 120 mm bore assembly. With about 9.8 kN of C per millimetre of the 120 mm bore, 22324EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 120 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 120 mm bore 22324EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22324EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22324EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22324EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 120×260 mm envelope is identical.",
      "The 1170/1280 kN ratings, 68.4 kN Pu and 22200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22324EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22324EMKD1?",
        "a": "22324EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 120 mm bore, 260 mm OD and 86 mm width (4.724 × 10.236 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1170 kN, C0 1280 kN, Pu 68.4 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 22200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22324EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22324EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22324EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22324EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22324EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22324EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1170 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22324EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22324EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22324emkd1",
      "＊22324emkd1",
      "22324EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5880,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23026EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×200×52 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23026EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 130 mm shaft seat directly; the same envelope in 23026EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23026EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23026EAD1 and its tapered-bore counterpart 23026EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 23026EAD1 and its tapered-bore counterpart 23026EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 23026EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×200 mm envelope is identical.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5880 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EAD1?",
        "a": "23026EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5880 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23026EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23026EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23026EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026ead1",
      "＊23026ead1",
      "23026EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23026EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 130 mm shaft — 565 kN basic dynamic capacity in a 5710 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 52 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EAKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23026EAKD1 on its adapter or withdrawal sleeve on the 130 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23026EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23026EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "Never substitute 23026EAKD1 by envelope alone: the 721 kN C0 and 44.2 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EAKD1?",
        "a": "23026EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5710 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23026EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23026EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23026EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026eakd1",
      "＊23026eakd1",
      "23026EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23026EMD1 identifies a 130×200×52 mm (5.118 × 7.874 × 2.047 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23026EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 130 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23026EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 23026EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23026EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EMD1?",
        "a": "23026EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23026EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23026EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23026EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026emd1",
      "＊23026emd1",
      "23026EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23026EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23026EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 565,
    "static_load_kN": 721,
    "fatigue_load_limit_kN": 44.2,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2900,
    "weight_g": 5730,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23026EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×200×52 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23026EMKD1 is assembled exactly in that order. The 35.0 mm radial section over the 130 mm bore carries two roller rows; capacity per millimetre of bore is about 4.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 23026EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23026EMKD1 on its adapter or withdrawal sleeve on the 130 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 23026EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23026EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 565/721 kN ratings, 44.2 kN Pu and 5730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23026EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23026EMKD1?",
        "a": "23026EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 52 mm width (5.118 × 7.874 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 565 kN, C0 721 kN, Pu 44.2 kN, grease limiting speed 2,200 r/min, oil 2,900 r/min, mass about 5730 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23026EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23026EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23026EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23026EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23026EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23026EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 565 kN C / 721 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23026EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23026EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=209",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23026emkd1",
      "＊23026emkd1",
      "23026EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24026EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24026EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 682,
    "static_load_kN": 936,
    "fatigue_load_limit_kN": 42.2,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 7820,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24026EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×200×69 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 200 mm OD / 69 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 130 mm bore is 5.118 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 682/936 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24026EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 24026EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 69 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 682 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24026EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 682/936 kN ratings, 42.2 kN Pu and 7820 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24026EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24026EMD1?",
        "a": "24026EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 69 mm width (5.118 × 7.874 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 682 kN, C0 936 kN, Pu 42.2 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 7820 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24026EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24026EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24026EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24026EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24026EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24026EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 682 kN C / 936 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24026EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24026EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24026emd1",
      "＊24026emd1",
      "24026EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24026EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24026EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 200,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 682,
    "static_load_kN": 936,
    "fatigue_load_limit_kN": 42.2,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 7710,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 24026EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,400 r/min. Numbering ties 24026EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 130 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 24026EMK30D1: EM identifies the high-capacity execution with a one-piece machined brass cage; K30 marks the 1:30 tapered bore of the wide series; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 130 mm bore is 5.118 in and 200 mm OD is 7.874 in; the ISO 15 envelope swaps between brands, but the 682/936 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 24026EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24026EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×200 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24026EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 682/936 kN ratings, 42.2 kN Pu and 7710 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24026EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24026EMK30D1?",
        "a": "24026EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 200 mm OD and 69 mm width (5.118 × 7.874 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 682 kN, C0 936 kN, Pu 42.2 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 7710 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24026EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 130 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24026EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24026EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24026EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24026EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24026EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 682 kN C / 936 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24026EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24026EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24026emk30d1",
      "＊24026emk30d1",
      "24026EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23126EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 210 mm OD / 64 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Selection: the C0/C ratio of 1.28 (906/710 kN) reflects the heavy static and shock proportioning of 23126EAD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23126EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23126EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "Never substitute 23126EAD1 by envelope alone: the 906 kN C0 and 47.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EAD1?",
        "a": "23126EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8450 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23126EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23126EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23126EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126ead1",
      "＊23126ead1",
      "23126EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8190,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23126EAKD1 identifies a 130×210×64 mm (5.118 × 8.268 × 2.52 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 130×210 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 710 kN C and 8190 g mass the 23100 series part is built for shock and vibration; the 64 mm-wide ring needs square abutments to keep both rows equally loaded. 130 mm bore is 5.118 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 710/906 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23126EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23126EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 64 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23126EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8190 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EAKD1?",
        "a": "23126EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8190 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23126EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23126EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23126EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126eakd1",
      "＊23126eakd1",
      "23126EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8510,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 23126EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 40.0 mm radial section over the 130 mm bore carries two roller rows; capacity per millimetre of bore is about 5.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.28 (906/710 kN) reflects the heavy static and shock proportioning of 23126EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 130 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 710 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23126EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 23126EMD1 and its tapered-bore counterpart 23126EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8510 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EMD1?",
        "a": "23126EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8510 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23126EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23126EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23126EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126emd1",
      "＊23126emd1",
      "23126EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23126EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23126EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 710,
    "static_load_kN": 906,
    "fatigue_load_limit_kN": 47.1,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 8250,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23126EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 130 mm bore, 210 mm OD, 64 mm width, rated 1,900 r/min on grease. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 210 mm OD / 64 mm width follow the general plan. Suffix reading on 23126EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 1,900 r/min limiting value is .79 of the 2,400 r/min oil value; heavy 64 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 64 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 130 mm bore 23126EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23126EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,900 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 710/906 kN ratings, 47.1 kN Pu and 8250 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23126EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23126EMKD1?",
        "a": "23126EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 64 mm width (5.118 × 8.268 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 710 kN, C0 906 kN, Pu 47.1 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 8250 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23126EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23126EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23126EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23126EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23126EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23126EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 710 kN C / 906 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23126EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23126EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23126emkd1",
      "＊23126emkd1",
      "23126EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24126EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24126EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 803,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2400,
    "weight_g": 10700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24126EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24126EMD1 is assembled exactly in that order. The cylindrical bore fits a machined 130 mm shaft seat directly; the same envelope in 24126EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Selection: the C0/C ratio of 1.34 (1080/803 kN) reflects the heavy static and shock proportioning of 24126EMD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 24126EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 210 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 130 mm bore 24126EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,400 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24126EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×210 mm envelope is identical.",
      "The 803/1080 kN ratings, 45 kN Pu and 10700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24126EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24126EMD1?",
        "a": "24126EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 80 mm width (5.118 × 8.268 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 803 kN, C0 1080 kN, Pu 45 kN, grease limiting speed 1,800 r/min, oil 2,400 r/min, mass about 10700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24126EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24126EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24126EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24126EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24126EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24126EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 803 kN C / 1080 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24126EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24126EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24126emd1",
      "＊24126emd1",
      "24126EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24126EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24126EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 210,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 803,
    "static_load_kN": 1080,
    "fatigue_load_limit_kN": 45,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2400,
    "weight_g": 10500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24126EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 130 mm shaft — 803 kN basic dynamic capacity in a 10500 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 40.0 mm radial section over the 130 mm bore carries two roller rows; capacity per millimetre of bore is about 6.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 45 kN against C0 1080 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24126EMK30D1 moves with cleanliness far more than with small C variations. Never mount 24126EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 210 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 130 mm bore 24126EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24126EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24126EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 803/1080 kN ratings, 45 kN Pu and 10500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24126EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24126EMK30D1?",
        "a": "24126EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 210 mm OD and 80 mm width (5.118 × 8.268 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 803 kN, C0 1080 kN, Pu 45 kN, grease limiting speed 1,800 r/min, oil 2,400 r/min, mass about 10500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24126EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 130 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24126EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24126EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24126EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24126EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24126EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 803 kN C / 1080 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24126EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24126EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24126emk30d1",
      "＊24126emk30d1",
      "24126EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 11000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22226EAD1 identifies a 130×230×64 mm (5.118 × 9.055 × 2.52 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 130 mm shaft seat directly; the same envelope in 22226EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. With about 6.2 kN of C per millimetre of the 130 mm bore, 22226EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 22226EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22226EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22226EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 22226EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×230 mm envelope is identical.",
      "The 808/898 kN ratings, 56.6 kN Pu and 11000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EAD1?",
        "a": "22226EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 11000 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22226EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22226EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22226EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226ead1",
      "＊22226ead1",
      "22226EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 10700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22226EAKD1 identifies a 130×230×64 mm (5.118 × 9.055 × 2.52 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 22226EAKD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. With about 6.2 kN of C per millimetre of the 130 mm bore, 22226EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22226EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22226EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22226EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 808/898 kN ratings, 56.6 kN Pu and 10700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EAKD1?",
        "a": "22226EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 10700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22226EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22226EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22226EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226eakd1",
      "＊22226eakd1",
      "22226EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 11100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22226EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 130 mm shaft — 808 kN basic dynamic capacity in a 11100 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 64 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 22226EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 56.6 kN against C0 898 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22226EMD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22226EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22226EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 130×230 mm envelope is identical.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 64 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 64 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 808/898 kN ratings, 56.6 kN Pu and 11100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EMD1?",
        "a": "22226EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 11100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22226EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22226EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22226EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226emd1",
      "＊22226emd1",
      "22226EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22226EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22226EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 64,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 808,
    "static_load_kN": 898,
    "fatigue_load_limit_kN": 56.6,
    "limiting_speed_rpm": 2200,
    "max_rpm": 2200,
    "speed_oil_rpm": 2800,
    "weight_g": 10900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22226EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 130 mm bore, 230 mm OD, 64 mm width, rated 2,200 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22226EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 6.2 kN of C per millimetre of the 130 mm bore, 22226EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22226EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 22226EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "Oil relubrication toward 2,800 r/min needs drain and level design; flooding the 64 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 808 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "The 808/898 kN ratings, 56.6 kN Pu and 10900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22226EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22226EMKD1?",
        "a": "22226EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 64 mm width (5.118 × 9.055 × 2.52 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 808 kN, C0 898 kN, Pu 56.6 kN, grease limiting speed 2,200 r/min, oil 2,800 r/min, mass about 10900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22226EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22226EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22226EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22226EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22226EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22226EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 808 kN C / 898 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22226EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22226EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22226emkd1",
      "＊22226emkd1",
      "22226EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23226EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23226EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 958,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 55.4,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2300,
    "weight_g": 13800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23226EMD1 identifies a 130×230×80 mm (5.118 × 9.055 × 3.15 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23226EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 55.4 kN against C0 1130 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23226EMD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 130 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 130 mm bore 23226EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23226EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23226EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 958/1130 kN ratings, 55.4 kN Pu and 13800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23226EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23226EMD1?",
        "a": "23226EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 80 mm width (5.118 × 9.055 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 958 kN, C0 1130 kN, Pu 55.4 kN, grease limiting speed 1,700 r/min, oil 2,300 r/min, mass about 13800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23226EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23226EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23226EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23226EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23226EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23226EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 958 kN C / 1130 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23226EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23226EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23226emd1",
      "＊23226emd1",
      "23226EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23226EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23226EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 230,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 958,
    "static_load_kN": 1130,
    "fatigue_load_limit_kN": 55.4,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2300,
    "weight_g": 13400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 23226EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,300 r/min. Digit by digit the code reads as spherical-roller dimension series plus 130 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 7.4 kN of C per millimetre of the 130 mm bore, 23226EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 130 mm bore 23226EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23226EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23226EMKD1 by envelope alone: the 1130 kN C0 and 55.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23226EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 958/1130 kN ratings, 55.4 kN Pu and 13400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23226EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23226EMKD1?",
        "a": "23226EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 230 mm OD and 80 mm width (5.118 × 9.055 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 958 kN, C0 1130 kN, Pu 55.4 kN, grease limiting speed 1,700 r/min, oil 2,300 r/min, mass about 13400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23226EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23226EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23226EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23226EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23226EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23226EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 958 kN C / 1130 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23226EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23226EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23226emkd1",
      "＊23226emkd1",
      "23226EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 27200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22326EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22326EAD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 1330 kN, C0 1400 kN (C0/C ≈ 1.05), with useful axial capacity in either direction alongside the dominant radial load. Grease/oil ratio: the 1,600 r/min limiting value is .80 of the 2,000 r/min oil value; heavy 93 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 22326EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 27200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EAD1?",
        "a": "22326EAD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 27200 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22326EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22326EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22326EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326ead1",
      "＊22326ead1",
      "22326EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 26600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22326EAKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 130×280×93 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22326EAKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 10.2 kN of C per millimetre of the 130 mm bore, 22326EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 130 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22326EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 130 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 93 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22326EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 26600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EAKD1?",
        "a": "22326EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 26600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22326EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22326EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22326EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326eakd1",
      "＊22326eakd1",
      "22326EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 28000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 22326EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,000 r/min. Numbering ties 22326EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 130 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22326EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 1,600 r/min limiting value is .80 of the 2,000 r/min oil value; heavy 93 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22326EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22326EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 22326EMD1 and its tapered-bore counterpart 22326EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 28000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EMD1?",
        "a": "22326EMD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 28000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22326EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22326EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22326EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326emd1",
      "＊22326emd1",
      "22326EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22326EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22326EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 130,
    "D_mm": 280,
    "B_mm": 93,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1330,
    "static_load_kN": 1400,
    "fatigue_load_limit_kN": 77.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 27500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 130 mm shaft, NTN supplies 22326EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,000 r/min. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 130 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 93 mm width follow the general plan. Two symmetric roller rows share the load: C 1330 kN, C0 1400 kN (C0/C ≈ 1.05), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 27500 g (27.50 kg) for the 130×280×93 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 130 mm bore 22326EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 93 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1330 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 130 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1330/1400 kN ratings, 77.8 kN Pu and 27500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22326EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22326EMKD1?",
        "a": "22326EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 130 mm bore, 280 mm OD and 93 mm width (5.118 × 11.024 × 3.661 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1330 kN, C0 1400 kN, Pu 77.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 27500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22326EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22326EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22326EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22326EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22326EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22326EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1330 kN C / 1400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22326EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22326EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22326emkd1",
      "＊22326emkd1",
      "22326EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23028EAD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×210×53 mm to ISO 15, with pressed sheet-steel window cage (EA high-capacity design). The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 210 mm OD / 53 mm width follow the general plan. The 35.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 4.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 597/783 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23028EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "Never substitute 23028EAD1 by envelope alone: the 783 kN C0 and 47.5 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23028EAD1 and its tapered-bore counterpart 23028EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EAD1?",
        "a": "23028EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6320 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23028EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23028EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23028EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028ead1",
      "＊23028ead1",
      "23028EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6130,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23028EAKD1 denotes the 140 mm bore spherical roller bearing (597 kN C / 783 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 2,100 r/min limiting value is .78 of the 2,700 r/min oil value; heavy 53 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 53 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23028EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×210 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23028EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6130 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EAKD1?",
        "a": "23028EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6130 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23028EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23028EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23028EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028eakd1",
      "＊23028eakd1",
      "23028EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23028EMD1 identifies a 140×210×53 mm (5.512 × 8.268 × 2.087 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 53 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 597 kN C and 6370 g mass the 23000 series part is built for shock and vibration; the 53 mm-wide ring needs square abutments to keep both rows equally loaded. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 597/783 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23028EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 2,700 r/min needs drain and level design; flooding the 53 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23028EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×210 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EMD1?",
        "a": "23028EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6370 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23028EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23028EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23028EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028emd1",
      "＊23028emd1",
      "23028EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23028EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23028EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 53,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 597,
    "static_load_kN": 783,
    "fatigue_load_limit_kN": 47.5,
    "limiting_speed_rpm": 2100,
    "max_rpm": 2100,
    "speed_oil_rpm": 2700,
    "weight_g": 6180,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23028EMKD1 identifies a 140×210×53 mm (5.512 × 8.268 × 2.087 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23028EMKD1 is assembled exactly in that order. Pu 47.5 kN is the catalogue fatigue load limit for 23028EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 597/783 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 140 mm bore 23028EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23028EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23028EMKD1 by envelope alone: the 783 kN C0 and 47.5 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23028EMKD1 by envelope alone: the 783 kN C0 and 47.5 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23028EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 597/783 kN ratings, 47.5 kN Pu and 6180 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23028EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23028EMKD1?",
        "a": "23028EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 53 mm width (5.512 × 8.268 × 2.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 597 kN, C0 783 kN, Pu 47.5 kN, grease limiting speed 2,100 r/min, oil 2,700 r/min, mass about 6180 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23028EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23028EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23028EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23028EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23028EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23028EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 597 kN C / 783 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23028EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23028EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23028emkd1",
      "＊23028emkd1",
      "23028EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24028EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24028EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 709,
    "static_load_kN": 990,
    "fatigue_load_limit_kN": 46,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 8270,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24028EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×210×69 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24028EMD1 is assembled exactly in that order. Suffix reading on 24028EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 140 mm bore is 5.512 in and 210 mm OD is 8.268 in; the ISO 15 envelope swaps between brands, but the 709/990 kN ratings and cage design are NTN 2203E values. Never mount 24028EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 210 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 140 mm bore 24028EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24028EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 24028EMD1 and its tapered-bore counterpart 24028EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 69 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 709/990 kN ratings, 46 kN Pu and 8270 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24028EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24028EMD1?",
        "a": "24028EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 69 mm width (5.512 × 8.268 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 709 kN, C0 990 kN, Pu 46 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 8270 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24028EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24028EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24028EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24028EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24028EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24028EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 709 kN C / 990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24028EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24028EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24028emd1",
      "＊24028emd1",
      "24028EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24028EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24028EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 210,
    "B_mm": 69,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 709,
    "static_load_kN": 990,
    "fatigue_load_limit_kN": 46,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 8150,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24028EMK30D1 denotes the 140 mm bore spherical roller bearing (709 kN C / 990 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 140×210 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 24028EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 46 kN against C0 990 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24028EMK30D1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 69 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 24028EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24028EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 69 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 709 kN rating no longer applies.",
      "The 709/990 kN ratings, 46 kN Pu and 8150 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24028EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24028EMK30D1?",
        "a": "24028EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 210 mm OD and 69 mm width (5.512 × 8.268 × 2.717 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 709 kN, C0 990 kN, Pu 46 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 8150 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24028EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 140 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24028EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24028EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24028EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24028EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24028EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 709 kN C / 990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24028EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24028EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24028emk30d1",
      "＊24028emk30d1",
      "24028EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 10300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23128EAD1 is assembled exactly in that order. Open by design, 23128EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.28 (1030/802 kN) reflects the heavy static and shock proportioning of 23128EAD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 23128EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 225 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23128EAD1 and its tapered-bore counterpart 23128EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 802 kN rating no longer applies.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 10300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EAD1?",
        "a": "23128EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 10300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23128EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23128EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23128EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128ead1",
      "＊23128ead1",
      "23128EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 9940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 140 mm shaft — 802 kN basic dynamic capacity in a 9940 g, open ISO 15 envelope. Reading the full code: the number gives the 140×225 mm envelope, EA names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 802 kN, C0 1030 kN (C0/C ≈ 1.28), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 9940 g (9.94 kg) for the 140×225×68 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 23128EAKD1 on its adapter or withdrawal sleeve on the 140 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23128EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23128EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23128EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 9940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EAKD1?",
        "a": "23128EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 9940 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23128EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23128EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23128EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128eakd1",
      "＊23128eakd1",
      "23128EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 10300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EMD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23128EMD1 is assembled exactly in that order. Pu 53.1 kN is the catalogue fatigue load limit for 23128EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 23128EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23128EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23128EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×225 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23128EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 10300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EMD1?",
        "a": "23128EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 10300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23128EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23128EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23128EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128emd1",
      "＊23128emd1",
      "23128EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23128EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23128EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 802,
    "static_load_kN": 1030,
    "fatigue_load_limit_kN": 53.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2200,
    "weight_g": 10000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23128EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×225×68 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 68 mm width follow the general plan. Open by design, 23128EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 140 mm bore is 5.512 in and 225 mm OD is 8.858 in; the ISO 15 envelope swaps between brands, but the 802/1030 kN ratings and cage design are NTN 2203E values. Mount 23128EMKD1 on its adapter or withdrawal sleeve on the 140 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 140 mm bore 23128EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23128EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×225 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 802 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 802 kN rating no longer applies.",
      "The 802/1030 kN ratings, 53.1 kN Pu and 10000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23128EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23128EMKD1?",
        "a": "23128EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 68 mm width (5.512 × 8.858 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 802 kN, C0 1030 kN, Pu 53.1 kN, grease limiting speed 1,800 r/min, oil 2,200 r/min, mass about 10000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23128EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23128EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23128EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23128EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23128EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23128EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 802 kN C / 1030 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23128EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23128EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23128emkd1",
      "＊23128emkd1",
      "23128EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24128EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24128EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 951,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 53.3,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24128EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 85 mm width follow the general plan. The 42.5 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 24128EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 85 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 140 mm bore 24128EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 951 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24128EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 140×225 mm envelope is identical.",
      "The cylindrical-bore 24128EMD1 and its tapered-bore counterpart 24128EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 951/1280 kN ratings, 53.3 kN Pu and 12900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24128EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24128EMD1?",
        "a": "24128EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 85 mm width (5.512 × 8.858 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 951 kN, C0 1280 kN, Pu 53.3 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24128EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24128EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24128EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24128EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24128EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24128EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 951 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24128EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24128EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24128emd1",
      "＊24128emd1",
      "24128EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24128EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24128EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 225,
    "B_mm": 85,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 951,
    "static_load_kN": 1280,
    "fatigue_load_limit_kN": 53.3,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24128EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×225×85 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 24128EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 140 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 42.5 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 85 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 24128EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24128EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24128EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24128EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 951/1280 kN ratings, 53.3 kN Pu and 12800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24128EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24128EMK30D1?",
        "a": "24128EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 225 mm OD and 85 mm width (5.512 × 8.858 × 3.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 951 kN, C0 1280 kN, Pu 53.3 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24128EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 140 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24128EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24128EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24128EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24128EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24128EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 951 kN C / 1280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24128EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24128EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24128emk30d1",
      "＊24128emk30d1",
      "24128EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 13900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22228EAD1 identifies a 140×250×68 mm (5.512 × 9.843 × 2.677 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 22228EAD1 is assembled exactly in that order. The 55.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 6.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 65.8 kN against C0 1010 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22228EAD1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22228EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 22228EAD1 and its tapered-bore counterpart 22228EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 13900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EAD1?",
        "a": "22228EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 13900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22228EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22228EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22228EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228ead1",
      "＊22228ead1",
      "22228EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 13600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22228EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 140 mm shaft — 912 kN basic dynamic capacity in a 13600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 68 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22228EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Catalogue mass 13600 g (13.60 kg) for the 140×250×68 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 22228EAKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 13600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EAKD1?",
        "a": "22228EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 13600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22228EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22228EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22228EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228eakd1",
      "＊22228eakd1",
      "22228EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 14200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22228EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 140 mm shaft — 912 kN basic dynamic capacity in a 14200 g, open ISO 15 envelope. Numbering ties 22228EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 140 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 912 kN C and 14200 g mass the 22200 series part is built for shock and vibration; the 68 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 65.8 kN against C0 1010 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22228EMD1 moves with cleanliness far more than with small C variations. Never mount 22228EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22228EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22228EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 912 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 2,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 14200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EMD1?",
        "a": "22228EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 14200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22228EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22228EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22228EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228emd1",
      "＊22228emd1",
      "22228EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22228EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22228EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 68,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 912,
    "static_load_kN": 1010,
    "fatigue_load_limit_kN": 65.8,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 13900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22228EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 140×250×68 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22228EMKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Pu 65.8 kN against C0 1010 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22228EMKD1 moves with cleanliness far more than with small C variations. Mount 22228EMKD1 on its adapter or withdrawal sleeve on the 140 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 140 mm bore 22228EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22228EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22228EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22228EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22228EMKD1 by envelope alone: the 1010 kN C0 and 65.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 912/1010 kN ratings, 65.8 kN Pu and 13900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22228EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22228EMKD1?",
        "a": "22228EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 68 mm width (5.512 × 9.843 × 2.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 912 kN, C0 1010 kN, Pu 65.8 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 13900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22228EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22228EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22228EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22228EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22228EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22228EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 912 kN C / 1010 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22228EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22228EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22228emkd1",
      "＊22228emkd1",
      "22228EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23228EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23228EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 64.2,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2100,
    "weight_g": 18200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23228EMD1 identifies a 140×250×88 mm (5.512 × 9.843 × 3.465 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 88 mm width follow the general plan. Suffix reading on 23228EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.20 (1370/1140 kN) reflects the heavy static and shock proportioning of 23228EMD1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 140 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 140 mm bore 23228EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 88 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23228EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 88 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1140/1370 kN ratings, 64.2 kN Pu and 18200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23228EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23228EMD1?",
        "a": "23228EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 88 mm width (5.512 × 9.843 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1370 kN, Pu 64.2 kN, grease limiting speed 1,600 r/min, oil 2,100 r/min, mass about 18200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23228EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23228EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23228EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23228EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23228EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23228EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23228EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23228EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23228emd1",
      "＊23228emd1",
      "23228EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23228EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23228EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 250,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1370,
    "fatigue_load_limit_kN": 64.2,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2100,
    "weight_g": 17700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23228EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 140 mm bore, 250 mm OD, 88 mm width, rated 1,600 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 88 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 55.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 8.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 64.2 kN against C0 1370 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23228EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 88 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 140 mm bore 23228EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 88 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23228EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1140 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23228EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1140/1370 kN ratings, 64.2 kN Pu and 17700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23228EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23228EMKD1?",
        "a": "23228EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 250 mm OD and 88 mm width (5.512 × 9.843 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1370 kN, Pu 64.2 kN, grease limiting speed 1,600 r/min, oil 2,100 r/min, mass about 17700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23228EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23228EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23228EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23228EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23228EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23228EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23228EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23228EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23228emkd1",
      "＊23228emkd1",
      "23228EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EAD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 34400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22328EAD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 102 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 11.0 kN of C per millimetre of the 140 mm bore, 22328EAD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 140 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22328EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22328EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22328EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 34400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EAD1?",
        "a": "22328EAD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 34400 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22328EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22328EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22328EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328ead1",
      "＊22328ead1",
      "22328EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EAKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 33700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22328EAKD1 identifies a 140×300×102 mm (5.512 × 11.811 × 4.016 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22328EAKD1 is assembled exactly in that order. The 80.0 mm radial section over the 140 mm bore carries two roller rows; capacity per millimetre of bore is about 11.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 88.8 kN against C0 1720 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22328EAKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22328EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 102 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22328EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 140 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22328EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 33700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EAKD1?",
        "a": "22328EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 33700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22328EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22328EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22328EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328eakd1",
      "＊22328eakd1",
      "22328EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 35400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 140 mm shaft, NTN supplies 22328EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,900 r/min. Digit by digit the code reads as spherical-roller dimension series plus 140 mm bore; the 102 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 88.8 kN is the catalogue fatigue load limit for 22328EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 11.0 kN of C per millimetre of the 140 mm bore, 22328EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 22328EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 300 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22328EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22328EMD1 by envelope alone: the 1720 kN C0 and 88.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22328EMD1 by envelope alone: the 1720 kN C0 and 88.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22328EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 35400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EMD1?",
        "a": "22328EMD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 35400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22328EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22328EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22328EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328emd1",
      "＊22328emd1",
      "22328EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22328EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22328EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 140,
    "D_mm": 300,
    "B_mm": 102,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1540,
    "static_load_kN": 1720,
    "fatigue_load_limit_kN": 88.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 34700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22328EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 140 mm bore, 300 mm OD, 102 mm width, rated 1,500 r/min on grease. The leading digits are the ISO 15 dimension series (22300 series); the bore code resolves to 140 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 102 mm width follow the general plan. At 1540 kN C and 34700 g mass the 22300 series part is built for shock and vibration; the 102 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 88.8 kN against C0 1720 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22328EMKD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22328EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 140 mm bore 22328EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1540 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 140 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1540/1720 kN ratings, 88.8 kN Pu and 34700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22328EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22328EMKD1?",
        "a": "22328EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 140 mm bore, 300 mm OD and 102 mm width (5.512 × 11.811 × 4.016 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1540 kN, C0 1720 kN, Pu 88.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 34700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22328EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22328EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22328EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22328EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22328EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22328EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1540 kN C / 1720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22328EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22328EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22328emkd1",
      "＊22328emkd1",
      "22328EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7680,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23030EAD1 identifies a 150×225×56 mm (5.906 × 8.858 × 2.205 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23030EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 52.9 kN is the catalogue fatigue load limit for 23030EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 7680 g (7.68 kg) for the 150×225×56 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 23030EAD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23030EAD1 and its tapered-bore counterpart 23030EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23030EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7680 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EAD1?",
        "a": "23030EAD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7680 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23030EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23030EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23030EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030ead1",
      "＊23030ead1",
      "23030EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7450,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23030EAKD1 denotes the 150 mm bore spherical roller bearing (660 kN C / 893 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23030EAKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 150 mm bore assembly. With about 4.4 kN of C per millimetre of the 150 mm bore, 23030EAKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23030EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23030EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×225 mm envelope is identical.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7450 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EAKD1?",
        "a": "23030EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7450 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23030EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23030EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23030EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030eakd1",
      "＊23030eakd1",
      "23030EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7730,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23030EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 150 mm shaft — 660 kN basic dynamic capacity in a 7730 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 150 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 56 mm width follow the general plan. Two symmetric roller rows share the load: C 660 kN, C0 893 kN (C0/C ≈ 1.35), with useful axial capacity in either direction alongside the dominant radial load. Catalogue mass 7730 g (7.73 kg) for the 150×225×56 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23030EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 2,500 r/min needs drain and level design; flooding the 56 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 56 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7730 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EMD1?",
        "a": "23030EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7730 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23030EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23030EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23030EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030emd1",
      "＊23030emd1",
      "23030EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23030EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23030EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 56,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 660,
    "static_load_kN": 893,
    "fatigue_load_limit_kN": 52.9,
    "limiting_speed_rpm": 2000,
    "max_rpm": 2000,
    "speed_oil_rpm": 2500,
    "weight_g": 7500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23030EMKD1 identifies a 150×225×56 mm (5.906 × 8.858 × 2.205 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 150 mm (two-digit code ×5, with the 00–03 exception table), and 225 mm OD / 56 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 7500 g (7.50 kg) for the 150×225×56 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23030EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 225 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 150 mm bore 23030EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23030EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23030EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The 660/893 kN ratings, 52.9 kN Pu and 7500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23030EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23030EMKD1?",
        "a": "23030EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 56 mm width (5.906 × 8.858 × 2.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 660 kN, C0 893 kN, Pu 52.9 kN, grease limiting speed 2,000 r/min, oil 2,500 r/min, mass about 7500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23030EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23030EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23030EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23030EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23030EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23030EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 660 kN C / 893 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23030EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23030EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23030emkd1",
      "＊23030emkd1",
      "23030EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24030EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24030EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 51.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 10400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24030EMD1 identifies a 150×225×75 mm (5.906 × 8.858 × 2.953 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 75 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 24030EMD1: 1,700 r/min grease and 2,100 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,100 r/min is the oil-lubricated value for the 150 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 150 mm bore 24030EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24030EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 789/1140 kN ratings, 51.2 kN Pu and 10400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24030EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24030EMD1?",
        "a": "24030EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 75 mm width (5.906 × 8.858 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1140 kN, Pu 51.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 10400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24030EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24030EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24030EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24030EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24030EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24030EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24030EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24030EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24030emd1",
      "＊24030emd1",
      "24030EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24030EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24030EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 225,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1140,
    "fatigue_load_limit_kN": 51.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 10300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24030EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 150 mm shaft — 789 kN basic dynamic capacity in a 10300 g, open ISO 15 envelope. Reading the full code: the number gives the 150×225 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 24030EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Catalogue mass 10300 g (10.30 kg) for the 150×225×75 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 75 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 150 mm bore 24030EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 75 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24030EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×225 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 789 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 789 kN rating no longer applies.",
      "The 789/1140 kN ratings, 51.2 kN Pu and 10300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24030EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24030EMK30D1?",
        "a": "24030EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 225 mm OD and 75 mm width (5.906 × 8.858 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1140 kN, Pu 51.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 10300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24030EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 150 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24030EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24030EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24030EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24030EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24030EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1140 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24030EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24030EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24030emk30d1",
      "＊24030emk30d1",
      "24030EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 150 mm shaft, NTN supplies 23130EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,000 r/min. Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23130EAD1: EA identifies the high-capacity execution with a pressed sheet-steel window cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 150 mm bore is 5.906 in and 250 mm OD is 9.843 in; the ISO 15 envelope swaps between brands, but the 1060/1350 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23130EAD1 and its tapered-bore counterpart 23130EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 23130EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×250 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EAD1?",
        "a": "23130EAD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23130EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23130EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23130EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130ead1",
      "＊23130ead1",
      "23130EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23130EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 150 mm shaft — 1060 kN basic dynamic capacity in a 15200 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 150 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 80 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 15200 g (15.20 kg) for the 150×250×80 mm execution includes the EA pressed-steel-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23130EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EAKD1?",
        "a": "23130EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15200 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23130EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23130EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23130EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130eakd1",
      "＊23130eakd1",
      "23130EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23130EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 150 mm bore, 250 mm OD, 80 mm width, rated 1,600 r/min on grease. Reading the full code: the number gives the 150×250 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 150 mm bore is 5.906 in and 250 mm OD is 9.843 in; the ISO 15 envelope swaps between brands, but the 1060/1350 kN ratings and cage design are NTN 2203E values. Never mount 23130EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EMD1?",
        "a": "23130EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23130EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23130EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23130EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130emd1",
      "＊23130emd1",
      "23130EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23130EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23130EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1060,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 65.1,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 15300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23130EMKD1 identifies a 150×250×80 mm (5.906 × 9.843 × 3.15 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 150×250 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23130EMKD1: 1,600 r/min grease and 2,000 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Catalogue mass 15300 g (15.30 kg) for the 150×250×80 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 23130EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23130EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23130EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×250 mm envelope is identical.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 80 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1060/1350 kN ratings, 65.1 kN Pu and 15300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23130EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23130EMKD1?",
        "a": "23130EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 80 mm width (5.906 × 9.843 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1060 kN, C0 1350 kN, Pu 65.1 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 15300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23130EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23130EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23130EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23130EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23130EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23130EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1060 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23130EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23130EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23130emkd1",
      "＊23130emkd1",
      "23130EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24130EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24130EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1590,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 19700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 150 mm shaft, NTN supplies 24130EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 2,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24130EMD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 1180 kN, C0 1590 kN (C0/C ≈ 1.35), with useful axial capacity in either direction alongside the dominant radial load. Pu 62.8 kN against C0 1590 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24130EMD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24130EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 24130EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1180 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24130EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1180/1590 kN ratings, 62.8 kN Pu and 19700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24130EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24130EMD1?",
        "a": "24130EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 100 mm width (5.906 × 9.843 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1590 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 19700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24130EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24130EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24130EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24130EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24130EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24130EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 1590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24130EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24130EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24130emd1",
      "＊24130emd1",
      "24130EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24130EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24130EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 250,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 1590,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 19400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24130EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 150×250×100 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 24130EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 24130EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.35 (1590/1180 kN) reflects the heavy static and shock proportioning of 24130EMK30D1; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 24130EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24130EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1180 kN rating no longer applies.",
      "The 1180/1590 kN ratings, 62.8 kN Pu and 19400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24130EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24130EMK30D1?",
        "a": "24130EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 250 mm OD and 100 mm width (5.906 × 9.843 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 1590 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 19400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24130EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 150 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24130EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24130EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24130EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24130EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24130EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 1590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24130EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24130EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24130emk30d1",
      "＊24130emk30d1",
      "24130EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 17600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22230EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 150 mm shaft — 1080 kN basic dynamic capacity in a 17600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 73 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 74.4 kN is the catalogue fatigue load limit for 22230EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 22230EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22230EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 150 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 17600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EAD1?",
        "a": "22230EAD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 17600 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22230EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22230EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22230EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230ead1",
      "＊22230ead1",
      "22230EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22230EAKD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 150 mm shaft — 1080 kN basic dynamic capacity in a 17300 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22230EAKD1 is assembled exactly in that order. Pu 74.4 kN is the catalogue fatigue load limit for 22230EAKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 1,800 r/min grease limiting speed is the cage/kinematic ceiling and 2,300 r/min is the oil-lubricated value for the 150 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 22230EAKD1 on its adapter or withdrawal sleeve on the 150 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1080 kN rating no longer applies.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 73 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EAKD1?",
        "a": "22230EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 17300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22230EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22230EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22230EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230eakd1",
      "＊22230eakd1",
      "22230EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 18000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22230EMD1 denotes the 150 mm bore spherical roller bearing (1080 kN C / 1220 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 150×270 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 1080 kN, C0 1220 kN (C0/C ≈ 1.13), with useful axial capacity in either direction alongside the dominant radial load. Equivalent-load planning keeps a radial plus moderate axial combination on 22230EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22230EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 73 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 18000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EMD1?",
        "a": "22230EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 18000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22230EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22230EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22230EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230emd1",
      "＊22230emd1",
      "22230EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22230EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22230EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 73,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1220,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 17700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22230EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 150×270×73 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 150 mm bore; the 73 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 22230EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 74.4 kN against C0 1220 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22230EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 22230EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22230EMKD1 by envelope alone: the 1220 kN C0 and 74.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22230EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22230EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1080 kN rating no longer applies.",
      "The 1080/1220 kN ratings, 74.4 kN Pu and 17700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22230EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22230EMKD1?",
        "a": "22230EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 73 mm width (5.906 × 10.63 × 2.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1220 kN, Pu 74.4 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 17700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22230EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22230EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22230EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22230EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22230EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22230EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1220 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22230EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22230EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22230emkd1",
      "＊22230emkd1",
      "22230EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23230EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23230EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1340,
    "static_load_kN": 1620,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 23600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23230EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 150 mm shaft — 1340 kN basic dynamic capacity in a 23600 g, open ISO 15 envelope. Numbering ties 23230EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23230EMD1: 1,500 r/min grease and 1,900 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23230EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 23230EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 150 mm bore 23230EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23230EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 150 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1340/1620 kN ratings, 74 kN Pu and 23600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23230EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23230EMD1?",
        "a": "23230EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 96 mm width (5.906 × 10.63 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1340 kN, C0 1620 kN, Pu 74 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 23600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23230EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23230EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23230EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23230EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23230EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23230EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1340 kN C / 1620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23230EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23230EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23230emd1",
      "＊23230emd1",
      "23230EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23230EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23230EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 270,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1340,
    "static_load_kN": 1620,
    "fatigue_load_limit_kN": 74,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 22900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23230EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 150×270×96 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23230EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1340 kN C and 22900 g mass the 23200 series part is built for shock and vibration; the 96 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 74 kN against C0 1620 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23230EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 150 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 150 mm bore 23230EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1340 kN rating no longer applies.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23230EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 150×270 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1340/1620 kN ratings, 74 kN Pu and 22900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23230EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23230EMKD1?",
        "a": "23230EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 270 mm OD and 96 mm width (5.906 × 10.63 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1340 kN, C0 1620 kN, Pu 74 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 22900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23230EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23230EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23230EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23230EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23230EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23230EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1340 kN C / 1620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23230EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23230EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23230emkd1",
      "＊23230emkd1",
      "23230EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22330EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22330EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1740,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 98.9,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 42200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22330EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 150 mm bore, 320 mm OD, 108 mm width, rated 1,400 r/min on grease. Numbering ties 22330EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 150 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1740 kN C and 42200 g mass the 22300 series part is built for shock and vibration; the 108 mm-wide ring needs square abutments to keep both rows equally loaded. Selection: the C0/C ratio of 1.09 (1890/1740 kN) reflects the heavy static and shock proportioning of 22330EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 150 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 150 mm bore 22330EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22330EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22330EMD1 by envelope alone: the 1890 kN C0 and 98.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22330EMD1 and its tapered-bore counterpart 22330EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1740/1890 kN ratings, 98.9 kN Pu and 42200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22330EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22330EMD1?",
        "a": "22330EMD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1740 kN, C0 1890 kN, Pu 98.9 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 42200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22330EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22330EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22330EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22330EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22330EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22330EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1740 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22330EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22330EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22330emd1",
      "＊22330emd1",
      "22330EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22330EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22330EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 150,
    "D_mm": 320,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1740,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 98.9,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 41300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22330EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 150 mm bore, 320 mm OD, 108 mm width, rated 1,400 r/min on grease. Reading the full code: the number gives the 150×320 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.09 (1890/1740 kN) reflects the heavy static and shock proportioning of 22330EMKD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 108 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 150 mm bore 22330EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 108 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 108 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 22330EMKD1 by envelope alone: the 1890 kN C0 and 98.9 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1740/1890 kN ratings, 98.9 kN Pu and 41300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22330EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22330EMKD1?",
        "a": "22330EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 150 mm bore, 320 mm OD and 108 mm width (5.906 × 12.598 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1740 kN, C0 1890 kN, Pu 98.9 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 41300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22330EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22330EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22330EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22330EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22330EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22330EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1740 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22330EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22330EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22330emkd1",
      "＊22330emkd1",
      "22330EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23932EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23932EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 455,
    "static_load_kN": 683,
    "fatigue_load_limit_kN": 45.6,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 5090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23932EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 220 mm OD / 45 mm width follow the general plan. Pu 45.6 kN is the catalogue fatigue load limit for 23932EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 45 mm-wide ring seats fully on both sides. Never mount 23932EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 220 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 23932EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23932EMD1 and its tapered-bore counterpart 23932EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23932EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×220 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23932EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 455/683 kN ratings, 45.6 kN Pu and 5090 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23932EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23932EMD1?",
        "a": "23932EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 45 mm width (6.299 × 8.661 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 683 kN, Pu 45.6 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 5090 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23932EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23932EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23932EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23932EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23932EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23932EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 455 kN C / 683 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23932EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23932EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23932emd1",
      "＊23932emd1",
      "23932EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23932EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23932EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 220,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 455,
    "static_load_kN": 683,
    "fatigue_load_limit_kN": 45.6,
    "limiting_speed_rpm": 1900,
    "max_rpm": 1900,
    "speed_oil_rpm": 2400,
    "weight_g": 4940,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23932EMKD1 identifies a 160×220×45 mm (6.299 × 8.661 × 1.772 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 220 mm OD / 45 mm width follow the general plan. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 160 mm bore assembly. Selection: the C0/C ratio of 1.50 (683/455 kN) reflects the heavy static and shock proportioning of 23932EMKD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23932EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 160 mm bore 23932EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23932EMKD1 by envelope alone: the 683 kN C0 and 45.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23932EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×220 mm envelope is identical.",
      "The 455/683 kN ratings, 45.6 kN Pu and 4940 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23932EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23932EMKD1?",
        "a": "23932EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 220 mm OD and 45 mm width (6.299 × 8.661 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 455 kN, C0 683 kN, Pu 45.6 kN, grease limiting speed 1,900 r/min, oil 2,400 r/min, mass about 4940 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23932EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23932EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23932EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23932EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23932EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23932EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 455 kN C / 683 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23932EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23932EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23932emkd1",
      "＊23932emkd1",
      "23932EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9320,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23032EAD1 identifies a 160×240×60 mm (6.299 × 9.449 × 2.362 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 1,800 r/min grease limiting speed is the cage/kinematic ceiling and 2,300 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 160 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 748 kN rating no longer applies.",
      "Never substitute 23032EAD1 by envelope alone: the 1000 kN C0 and 59.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9320 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EAD1?",
        "a": "23032EAD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9320 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23032EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23032EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23032EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032ead1",
      "＊23032ead1",
      "23032EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9030,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23032EAKD1 belongs to the 23000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23032EAKD1 is assembled exactly in that order. Open by design, 23032EAKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 59.1 kN against C0 1000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23032EAKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23032EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23032EAKD1 by envelope alone: the 1000 kN C0 and 59.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 748 kN rating no longer applies.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9030 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EAKD1?",
        "a": "23032EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9030 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23032EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23032EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23032EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032eakd1",
      "＊23032eakd1",
      "23032EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9370,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23032EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 160 mm shaft — 748 kN basic dynamic capacity in a 9370 g, open ISO 15 envelope. Reading the full code: the number gives the 160×240 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 1,800 r/min grease limiting speed is the cage/kinematic ceiling and 2,300 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23032EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 240 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23032EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9370 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EMD1?",
        "a": "23032EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9370 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23032EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23032EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23032EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032emd1",
      "＊23032emd1",
      "23032EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23032EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23032EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 748,
    "static_load_kN": 1000,
    "fatigue_load_limit_kN": 59.1,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 9090,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23032EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 160 mm shaft — 748 kN basic dynamic capacity in a 9090 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 240 mm OD / 60 mm width follow the general plan. NTN prints two speeds for 23032EMKD1: 1,800 r/min grease and 2,300 r/min oil — the gap of 500 r/min reflects oil cooling of the heavy roller set. Pu 59.1 kN against C0 1000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23032EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 160 mm bore 23032EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23032EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 2,300 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 748/1000 kN ratings, 59.1 kN Pu and 9090 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23032EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23032EMKD1?",
        "a": "23032EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 60 mm width (6.299 × 9.449 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 748 kN, C0 1000 kN, Pu 59.1 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 9090 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23032EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23032EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23032EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23032EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23032EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23032EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 748 kN C / 1000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23032EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23032EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23032emkd1",
      "＊23032emkd1",
      "23032EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24032EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24032EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 901,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 56.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 12600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24032EMD1 identifies a 160×240×80 mm (6.299 × 9.449 × 3.15 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24032EMD1 is assembled exactly in that order. Open by design, 24032EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 24032EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24032EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 160 mm bore 24032EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24032EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 24032EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×240 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 901 kN rating no longer applies.",
      "The 901/1290 kN ratings, 56.8 kN Pu and 12600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24032EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24032EMD1?",
        "a": "24032EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 80 mm width (6.299 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 901 kN, C0 1290 kN, Pu 56.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 12600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24032EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24032EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24032EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24032EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24032EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24032EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 901 kN C / 1290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24032EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24032EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24032emd1",
      "＊24032emd1",
      "24032EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24032EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24032EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 240,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 901,
    "static_load_kN": 1290,
    "fatigue_load_limit_kN": 56.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 12400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24032EMK30D1 identifies a 160×240×80 mm (6.299 × 9.449 × 3.15 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 56.8 kN against C0 1290 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24032EMK30D1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 160 mm bore 24032EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24032EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24032EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24032EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24032EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 901/1290 kN ratings, 56.8 kN Pu and 12400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24032EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24032EMK30D1?",
        "a": "24032EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 240 mm OD and 80 mm width (6.299 × 9.449 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 901 kN, C0 1290 kN, Pu 56.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 12400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24032EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 160 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24032EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24032EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24032EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24032EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24032EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 901 kN C / 1290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24032EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24032EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24032emk30d1",
      "＊24032emk30d1",
      "24032EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 20100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 160 mm shaft, NTN supplies 23132EAD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 1,900 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23132EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 160 mm shaft seat directly; the same envelope in 23132EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 73.6 kN against C0 1580 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23132EAD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23132EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23132EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23132EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 20100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EAD1?",
        "a": "23132EAD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 20100 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23132EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23132EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23132EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132ead1",
      "＊23132ead1",
      "23132EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 19500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23132EAKD1 denotes the 160 mm bore spherical roller bearing (1220 kN C / 1580 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 270 mm OD / 86 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. Pu 73.6 kN against C0 1580 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23132EAKD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23132EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23132EAKD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 19500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EAKD1?",
        "a": "23132EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 19500 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23132EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23132EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23132EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132eakd1",
      "＊23132eakd1",
      "23132EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 20200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 160 mm shaft, NTN supplies 23132EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,900 r/min. Numbering ties 23132EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 20200 g (20.20 kg) for the 160×270×86 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23132EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23132EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Never substitute 23132EMD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 20200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EMD1?",
        "a": "23132EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 20200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23132EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23132EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23132EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132emd1",
      "＊23132emd1",
      "23132EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23132EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23132EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1580,
    "fatigue_load_limit_kN": 73.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 19600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23132EMKD1 identifies a 160×270×86 mm (6.299 × 10.63 × 3.386 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 160×270 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 1220 kN C and 19600 g mass the 23100 series part is built for shock and vibration; the 86 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 1,500 r/min grease limiting speed is the cage/kinematic ceiling and 1,900 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23132EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 160 mm bore 23132EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23132EMKD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23132EMKD1 by envelope alone: the 1580 kN C0 and 73.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23132EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1220/1580 kN ratings, 73.6 kN Pu and 19600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23132EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23132EMKD1?",
        "a": "23132EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 86 mm width (6.299 × 10.63 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1580 kN, Pu 73.6 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 19600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23132EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23132EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23132EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23132EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23132EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23132EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1580 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23132EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23132EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=210",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23132emkd1",
      "＊23132emkd1",
      "23132EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24132EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24132EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 70.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 25400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24132EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 160 mm (two-digit code ×5, with the 00–03 exception table), and 270 mm OD / 109 mm width follow the general plan. The cylindrical bore fits a machined 160 mm shaft seat directly; the same envelope in 24132EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Selection: the C0/C ratio of 1.37 (1860/1360 kN) reflects the heavy static and shock proportioning of 24132EMD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24132EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 24132EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24132EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 109 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 24132EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "The 1360/1860 kN ratings, 70.6 kN Pu and 25400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24132EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24132EMD1?",
        "a": "24132EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 109 mm width (6.299 × 10.63 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1860 kN, Pu 70.6 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 25400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24132EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24132EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24132EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24132EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24132EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24132EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 1860 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24132EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24132EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24132emd1",
      "＊24132emd1",
      "24132EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24132EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24132EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 270,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 1860,
    "fatigue_load_limit_kN": 70.6,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1800,
    "weight_g": 25100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 160 mm shaft, NTN supplies 24132EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,800 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24132EMK30D1 is assembled exactly in that order. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 160 mm bore assembly. The 55.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 109 mm-wide ring seats fully on both sides. Never mount 24132EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 270 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 24132EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 24132EMK30D1 by envelope alone: the 1860 kN C0 and 70.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24132EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24132EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×270 mm envelope is identical.",
      "The 1360/1860 kN ratings, 70.6 kN Pu and 25100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24132EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24132EMK30D1?",
        "a": "24132EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 270 mm OD and 109 mm width (6.299 × 10.63 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 1860 kN, Pu 70.6 kN, grease limiting speed 1,500 r/min, oil 1,800 r/min, mass about 25100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24132EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 160 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24132EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24132EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24132EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24132EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24132EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 1860 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24132EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24132EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24132emk30d1",
      "＊24132emk30d1",
      "24132EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EAD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 22300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22232EAD1 is the EA pressed-steel-cage execution of NTN's spherical roller range for a 160 mm shaft — 1220 kN basic dynamic capacity in a 22300 g, open ISO 15 envelope. Numbering ties 22232EAD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 22232EAD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22232EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 290 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 22300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EAD1?",
        "a": "22232EAD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 22300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22232EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22232EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22232EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232ead1",
      "＊22232ead1",
      "22232EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EAKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 21800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22232EAKD1 denotes the 160 mm bore spherical roller bearing (1220 kN C / 1390 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 22232EAKD1 is assembled exactly in that order. At 1220 kN C and 21800 g mass the 22200 series part is built for shock and vibration; the 80 mm-wide ring needs square abutments to keep both rows equally loaded. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 80 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22232EAD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EAKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22232EAKD1 by envelope alone: the 1390 kN C0 and 84.1 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 21800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EAKD1?",
        "a": "22232EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 21800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22232EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22232EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22232EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232eakd1",
      "＊22232eakd1",
      "22232EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 22900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22232EMD1 denotes the 160 mm bore spherical roller bearing (1220 kN C / 1390 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22232EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 160 mm bore is 6.299 in and 290 mm OD is 11.417 in; the ISO 15 envelope swaps between brands, but the 1220/1390 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 80 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22232EMD1 by envelope alone: the 1390 kN C0 and 84.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1220 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22232EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 22900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EMD1?",
        "a": "22232EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 22900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22232EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22232EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22232EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232emd1",
      "＊22232emd1",
      "22232EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22232EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22232EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 80,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1220,
    "static_load_kN": 1390,
    "fatigue_load_limit_kN": 84.1,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 22400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22232EMKD1 identifies a 160×290×80 mm (6.299 × 11.417 × 3.15 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 80 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 160 mm bore assembly. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,100 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 160 mm bore 22232EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "The 1220/1390 kN ratings, 84.1 kN Pu and 22400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22232EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22232EMKD1?",
        "a": "22232EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 80 mm width (6.299 × 11.417 × 3.15 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1220 kN, C0 1390 kN, Pu 84.1 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 22400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22232EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22232EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22232EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22232EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22232EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22232EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1220 kN C / 1390 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22232EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22232EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22232emkd1",
      "＊22232emkd1",
      "22232EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23232EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23232EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1550,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 83.8,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 29600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23232EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 160 mm shaft — 1550 kN basic dynamic capacity in a 29600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 104 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23232EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 9.7 kN of C per millimetre of the 160 mm bore, 23232EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 160 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 160 mm bore 23232EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23232EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1550 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1550 kN rating no longer applies.",
      "The 1550/1890 kN ratings, 83.8 kN Pu and 29600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23232EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23232EMD1?",
        "a": "23232EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 104 mm width (6.299 × 11.417 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1550 kN, C0 1890 kN, Pu 83.8 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 29600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23232EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23232EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23232EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23232EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23232EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23232EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1550 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23232EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23232EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23232emd1",
      "＊23232emd1",
      "23232EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23232EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23232EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 290,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1550,
    "static_load_kN": 1890,
    "fatigue_load_limit_kN": 83.8,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 28800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23232EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 160×290×104 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23232EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 160 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23232EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 160 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 160 mm bore 23232EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23232EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 23232EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 160×290 mm envelope is identical.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 104 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 104 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1550/1890 kN ratings, 83.8 kN Pu and 28800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23232EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23232EMKD1?",
        "a": "23232EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 290 mm OD and 104 mm width (6.299 × 11.417 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1550 kN, C0 1890 kN, Pu 83.8 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 28800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23232EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23232EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23232EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23232EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23232EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23232EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1550 kN C / 1890 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23232EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23232EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23232emkd1",
      "＊23232emkd1",
      "23232EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22332EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22332EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1950,
    "static_load_kN": 2210,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 50500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22332EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 160 mm bore, 340 mm OD, 114 mm width, rated 1,300 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 160 mm bore; the 114 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 22332EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 160 mm bore 22332EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 114 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22332EMD1 by envelope alone: the 2210 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 22332EMD1 by envelope alone: the 2210 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1950/2210 kN ratings, 109 kN Pu and 50500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22332EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22332EMD1?",
        "a": "22332EMD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1950 kN, C0 2210 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 50500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22332EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22332EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22332EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22332EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22332EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22332EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1950 kN C / 2210 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22332EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22332EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22332emd1",
      "＊22332emd1",
      "22332EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22332EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22332EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 160,
    "D_mm": 340,
    "B_mm": 114,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1950,
    "static_load_kN": 2210,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 49500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22332EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 160×340×114 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 160×340 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22332EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 160 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 160 mm bore 22332EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 160 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22332EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 160 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22332EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1950/2210 kN ratings, 109 kN Pu and 49500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22332EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22332EMKD1?",
        "a": "22332EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 160 mm bore, 340 mm OD and 114 mm width (6.299 × 13.386 × 4.488 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1950 kN, C0 2210 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 49500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22332EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22332EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22332EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22332EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22332EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22332EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1950 kN C / 2210 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22332EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22332EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22332emkd1",
      "＊22332emkd1",
      "22332EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23934EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23934EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 468,
    "static_load_kN": 723,
    "fatigue_load_limit_kN": 48.8,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 5390,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23934EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23934EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 23934EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 170 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 170 mm bore 23934EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 468 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 45 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23934EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 468/723 kN ratings, 48.8 kN Pu and 5390 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23934EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23934EMD1?",
        "a": "23934EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 45 mm width (6.693 × 9.055 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 468 kN, C0 723 kN, Pu 48.8 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 5390 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23934EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23934EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23934EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23934EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23934EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23934EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 468 kN C / 723 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23934EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23934EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23934emd1",
      "＊23934emd1",
      "23934EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23934EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23934EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 230,
    "B_mm": 45,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 468,
    "static_load_kN": 723,
    "fatigue_load_limit_kN": 48.8,
    "limiting_speed_rpm": 1800,
    "max_rpm": 1800,
    "speed_oil_rpm": 2300,
    "weight_g": 5230,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23934EMKD1 identifies a 170×230×45 mm (6.693 × 9.055 × 1.772 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 230 mm OD / 45 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 30.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 45 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23934EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 170 mm bore 23934EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23934EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×230 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 468 kN rating no longer applies.",
      "Never substitute 23934EMKD1 by envelope alone: the 723 kN C0 and 48.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 170 mm bearing, and drive-up procedures differ.",
      "The 468/723 kN ratings, 48.8 kN Pu and 5230 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23934EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23934EMKD1?",
        "a": "23934EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 230 mm OD and 45 mm width (6.693 × 9.055 × 1.772 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 468 kN, C0 723 kN, Pu 48.8 kN, grease limiting speed 1,800 r/min, oil 2,300 r/min, mass about 5230 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23934EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23934EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23934EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23934EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23934EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23934EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 468 kN C / 723 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23934EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23934EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23934emkd1",
      "＊23934emkd1",
      "23934EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23034EAD1 identifies a 170×260×67 mm (6.693 × 10.236 × 2.638 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23034EAD1 is assembled exactly in that order. The cylindrical bore fits a machined 170 mm shaft seat directly; the same envelope in 23034EAKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 67 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 170 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23034EAD1 by envelope alone: the 1240 kN C0 and 68.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23034EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×260 mm envelope is identical.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EAD1?",
        "a": "23034EAD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12700 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23034EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23034EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23034EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034ead1",
      "＊23034ead1",
      "23034EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 170 mm shaft, NTN supplies 23034EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,200 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23034EAKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 170 mm bore assembly. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,200 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 23034EAKD1 on its adapter or withdrawal sleeve on the 170 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,200 r/min needs drain and level design; flooding the 67 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23034EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23034EAKD1 by envelope alone: the 1240 kN C0 and 68.8 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23034EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×260 mm envelope is identical.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EAKD1?",
        "a": "23034EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23034EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23034EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23034EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034eakd1",
      "＊23034eakd1",
      "23034EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23034EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 914 kN basic dynamic capacity in a 12800 g, open ISO 15 envelope. Numbering ties 23034EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23034EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 67 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 67 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23034EMD1 and its tapered-bore counterpart 23034EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23034EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EMD1?",
        "a": "23034EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23034EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23034EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23034EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034emd1",
      "＊23034emd1",
      "23034EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23034EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23034EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 67,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 914,
    "static_load_kN": 1240,
    "fatigue_load_limit_kN": 68.8,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2200,
    "weight_g": 12400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23034EMKD1 denotes the 170 mm bore spherical roller bearing (914 kN C / 1240 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 260 mm OD / 67 mm width follow the general plan. Suffix reading on 23034EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,700 r/min grease limiting speed is the cage/kinematic ceiling and 2,200 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 23034EMKD1 on its adapter or withdrawal sleeve on the 170 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 170 mm bore 23034EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,700 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 67 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 914/1240 kN ratings, 68.8 kN Pu and 12400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23034EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23034EMKD1?",
        "a": "23034EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 67 mm width (6.693 × 10.236 × 2.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 914 kN, C0 1240 kN, Pu 68.8 kN, grease limiting speed 1,700 r/min, oil 2,200 r/min, mass about 12400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23034EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23034EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23034EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23034EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23034EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23034EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 914 kN C / 1240 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23034EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23034EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23034emkd1",
      "＊23034emkd1",
      "23034EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24034EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24034EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1100,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 66.3,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24034EMD1 identifies a 170×260×90 mm (6.693 × 10.236 × 3.543 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 66.3 kN is the catalogue fatigue load limit for 24034EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 24034EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 24034EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 260 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 24034EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24034EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1100/1600 kN ratings, 66.3 kN Pu and 17200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24034EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24034EMD1?",
        "a": "24034EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 90 mm width (6.693 × 10.236 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1100 kN, C0 1600 kN, Pu 66.3 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24034EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24034EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24034EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24034EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24034EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24034EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1100 kN C / 1600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24034EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24034EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24034emd1",
      "＊24034emd1",
      "24034EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24034EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24034EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 260,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1100,
    "static_load_kN": 1600,
    "fatigue_load_limit_kN": 66.3,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 16900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24034EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 170 mm bore, 260 mm OD, 90 mm width, rated 1,500 r/min on grease. Numbering ties 24034EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. The 45.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 90 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 90 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 170 mm bore 24034EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1100 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24034EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 170 mm bearing, and drive-up procedures differ.",
      "Never substitute 24034EMK30D1 by envelope alone: the 1600 kN C0 and 66.3 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1100/1600 kN ratings, 66.3 kN Pu and 16900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24034EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24034EMK30D1?",
        "a": "24034EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 260 mm OD and 90 mm width (6.693 × 10.236 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1100 kN, C0 1600 kN, Pu 66.3 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 16900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24034EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 170 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24034EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24034EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24034EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24034EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24034EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1100 kN C / 1600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24034EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24034EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24034emk30d1",
      "＊24034emk30d1",
      "24034EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 21500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23134EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 88 mm width follow the general plan. Open by design, 23134EAD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.34 (1700/1270 kN) reflects the heavy static and shock proportioning of 23134EAD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23134EAD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23134EAD1 and its tapered-bore counterpart 23134EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23134EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23134EAD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1270 kN rating no longer applies.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 21500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EAD1?",
        "a": "23134EAD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 21500 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23134EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23134EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23134EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134ead1",
      "＊23134ead1",
      "23134EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 20900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23134EAKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 170 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 88 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23134EAKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23134EAKD1 by envelope alone: the 1700 kN C0 and 77.3 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 88 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1270 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 170 mm bearing, and drive-up procedures differ.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 20900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EAKD1?",
        "a": "23134EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 20900 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23134EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23134EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23134EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134eakd1",
      "＊23134eakd1",
      "23134EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 21600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 170 mm shaft, NTN supplies 23134EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,800 r/min. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 88 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23134EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 170 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 88 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23134EMD1 by envelope alone: the 1700 kN C0 and 77.3 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 88 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1270 kN rating no longer applies.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 21600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EMD1?",
        "a": "23134EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 21600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23134EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23134EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23134EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134emd1",
      "＊23134emd1",
      "23134EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23134EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23134EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 88,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1270,
    "static_load_kN": 1700,
    "fatigue_load_limit_kN": 77.3,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 20900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23134EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1270 kN basic dynamic capacity in a 20900 g, open ISO 15 envelope. Reading the full code: the number gives the 170×280 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 77.3 kN is the catalogue fatigue load limit for 23134EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Selection: the C0/C ratio of 1.34 (1700/1270 kN) reflects the heavy static and shock proportioning of 23134EMKD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 88 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 170 mm bore 23134EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23134EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23134EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23134EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1270/1700 kN ratings, 77.3 kN Pu and 20900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23134EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23134EMKD1?",
        "a": "23134EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 88 mm width (6.693 × 11.024 × 3.465 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1270 kN, C0 1700 kN, Pu 77.3 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 20900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23134EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23134EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23134EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23134EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23134EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23134EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1270 kN C / 1700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23134EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23134EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23134emkd1",
      "＊23134emkd1",
      "23134EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24134EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24134EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1410,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 26700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24134EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24134EMD1 is assembled exactly in that order. The 55.0 mm radial section over the 170 mm bore carries two roller rows; capacity per millimetre of bore is about 8.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.41 (1990/1410 kN) reflects the heavy static and shock proportioning of 24134EMD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 24134EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 280 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 24134EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24134EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24134EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×280 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 109 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 24134EMD1 and its tapered-bore counterpart 24134EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1410/1990 kN ratings, 74.4 kN Pu and 26700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24134EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24134EMD1?",
        "a": "24134EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 109 mm width (6.693 × 11.024 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1410 kN, C0 1990 kN, Pu 74.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 26700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24134EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24134EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24134EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24134EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24134EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24134EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1410 kN C / 1990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24134EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24134EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24134emd1",
      "＊24134emd1",
      "24134EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24134EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24134EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 280,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1410,
    "static_load_kN": 1990,
    "fatigue_load_limit_kN": 74.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 26300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24134EMK30D1 denotes the 170 mm bore spherical roller bearing (1410 kN C / 1990 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 109 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 1410 kN, C0 1990 kN (C0/C ≈ 1.41), with useful axial capacity in either direction alongside the dominant radial load. 170 mm bore is 6.693 in and 280 mm OD is 11.024 in; the ISO 15 envelope swaps between brands, but the 1410/1990 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 170 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 170 mm bore 24134EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24134EMK30D1 by envelope alone: the 1990 kN C0 and 74.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24134EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24134EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1410/1990 kN ratings, 74.4 kN Pu and 26300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24134EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24134EMK30D1?",
        "a": "24134EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 280 mm OD and 109 mm width (6.693 × 11.024 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1410 kN, C0 1990 kN, Pu 74.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 26300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24134EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 170 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24134EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24134EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24134EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24134EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24134EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1410 kN C / 1990 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24134EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24134EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24134emk30d1",
      "＊24134emk30d1",
      "24134EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22234EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22234EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1400,
    "static_load_kN": 1610,
    "fatigue_load_limit_kN": 94.7,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 28300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22234EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1400 kN basic dynamic capacity in a 28300 g, open ISO 15 envelope. Reading the full code: the number gives the 170×310 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The 70.0 mm radial section over the 170 mm bore carries two roller rows; capacity per millimetre of bore is about 8.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 170 mm bore is 6.693 in and 310 mm OD is 12.205 in; the ISO 15 envelope swaps between brands, but the 1400/1610 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 170 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 170 mm bore 22234EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 22234EMD1 and its tapered-bore counterpart 22234EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 22234EMD1 and its tapered-bore counterpart 22234EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The cylindrical-bore 22234EMD1 and its tapered-bore counterpart 22234EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1400/1610 kN ratings, 94.7 kN Pu and 28300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22234EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22234EMD1?",
        "a": "22234EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1400 kN, C0 1610 kN, Pu 94.7 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 28300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22234EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22234EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22234EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22234EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22234EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22234EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1400 kN C / 1610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22234EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22234EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22234emd1",
      "＊22234emd1",
      "22234EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22234EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22234EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1400,
    "static_load_kN": 1610,
    "fatigue_load_limit_kN": 94.7,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 27700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22234EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1400 kN basic dynamic capacity in a 27700 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 170 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 1400 kN, C0 1610 kN (C0/C ≈ 1.15), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.15 (1610/1400 kN) reflects the heavy static and shock proportioning of 22234EMKD1; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22234EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 170 mm bore 22234EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22234EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 86 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1400/1610 kN ratings, 94.7 kN Pu and 27700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22234EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22234EMKD1?",
        "a": "22234EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 86 mm width (6.693 × 12.205 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1400 kN, C0 1610 kN, Pu 94.7 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 27700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22234EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22234EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22234EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22234EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22234EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22234EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1400 kN C / 1610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22234EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22234EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22234emkd1",
      "＊22234emkd1",
      "22234EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23234EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23234EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 110,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1700,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 94.6,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 35800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23234EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 170 mm shaft — 1700 kN basic dynamic capacity in a 35800 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23234EMD1 is assembled exactly in that order. Pu 94.6 kN is the catalogue fatigue load limit for 23234EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 94.6 kN against C0 2070 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23234EMD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 170 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 170 mm bore 23234EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23234EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 170×310 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23234EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23234EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1700/2070 kN ratings, 94.6 kN Pu and 35800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23234EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23234EMD1?",
        "a": "23234EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 110 mm width (6.693 × 12.205 × 4.331 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1700 kN, C0 2070 kN, Pu 94.6 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 35800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23234EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23234EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23234EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23234EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23234EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23234EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1700 kN C / 2070 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23234EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23234EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23234emd1",
      "＊23234emd1",
      "23234EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23234EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23234EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 310,
    "B_mm": 110,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1700,
    "static_load_kN": 2070,
    "fatigue_load_limit_kN": 94.6,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 34800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23234EMKD1 identifies a 170×310×110 mm (6.693 × 12.205 × 4.331 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 23234EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 23234EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.22 (2070/1700 kN) reflects the heavy static and shock proportioning of 23234EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 23234EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 110 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 110 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23234EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1700 kN rating no longer applies.",
      "The 1700/2070 kN ratings, 94.6 kN Pu and 34800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23234EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23234EMKD1?",
        "a": "23234EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 310 mm OD and 110 mm width (6.693 × 12.205 × 4.331 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1700 kN, C0 2070 kN, Pu 94.6 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 34800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23234EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23234EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23234EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23234EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23234EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23234EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1700 kN C / 2070 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23234EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23234EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23234emkd1",
      "＊23234emkd1",
      "23234EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22334EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22334EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2200,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 60300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22334EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 170 mm bore, 360 mm OD, 120 mm width, rated 1,200 r/min on grease. Numbering ties 22334EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 170 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22334EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Equivalent-load planning keeps a radial plus moderate axial combination on 22334EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 170 mm bore 22334EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2200 kN rating no longer applies.",
      "The 2200/2630 kN ratings, 121 kN Pu and 60300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22334EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22334EMD1?",
        "a": "22334EMD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2200 kN, C0 2630 kN, Pu 121 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 60300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22334EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22334EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22334EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22334EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22334EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22334EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2200 kN C / 2630 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22334EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22334EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22334emd1",
      "＊22334emd1",
      "22334EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22334EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22334EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 170,
    "D_mm": 360,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2200,
    "static_load_kN": 2630,
    "fatigue_load_limit_kN": 121,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 59100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22334EMKD1 identifies a 170×360×120 mm (6.693 × 14.173 × 4.724 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 170×360 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Grease/oil ratio: the 1,200 r/min limiting value is .80 of the 1,500 r/min oil value; heavy 120 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 170 mm bore 22334EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 170 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 120 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 22334EMKD1 by envelope alone: the 2630 kN C0 and 121 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2200/2630 kN ratings, 121 kN Pu and 59100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22334EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22334EMKD1?",
        "a": "22334EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 170 mm bore, 360 mm OD and 120 mm width (6.693 × 14.173 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2200 kN, C0 2630 kN, Pu 121 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 59100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22334EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22334EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22334EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22334EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22334EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22334EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2200 kN C / 2630 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22334EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22334EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22334emkd1",
      "＊22334emkd1",
      "22334EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23936EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23936EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 573,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 57.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 7790,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23936EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 52 mm width follow the general plan. Suffix reading on 23936EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 180 mm bore is 7.087 in and 250 mm OD is 9.843 in; the ISO 15 envelope swaps between brands, but the 573/869 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 180 mm bore 23936EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23936EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23936EMD1 and its tapered-bore counterpart 23936EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 23936EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×250 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 52 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 573/869 kN ratings, 57.2 kN Pu and 7790 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23936EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23936EMD1?",
        "a": "23936EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 52 mm width (7.087 × 9.843 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 573 kN, C0 869 kN, Pu 57.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 7790 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23936EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23936EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23936EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23936EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23936EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23936EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 573 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23936EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23936EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23936emd1",
      "＊23936emd1",
      "23936EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23936EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23936EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 250,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 573,
    "static_load_kN": 869,
    "fatigue_load_limit_kN": 57.2,
    "limiting_speed_rpm": 1700,
    "max_rpm": 1700,
    "speed_oil_rpm": 2100,
    "weight_g": 7560,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23936EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 573 kN basic dynamic capacity in a 7560 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 250 mm OD / 52 mm width follow the general plan. NTN prints two speeds for 23936EMKD1: 1,700 r/min grease and 2,100 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23936EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 23936EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 250 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 180 mm bore 23936EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23936EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23936EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 2,100 r/min needs drain and level design; flooding the 52 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 573/869 kN ratings, 57.2 kN Pu and 7560 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23936EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23936EMKD1?",
        "a": "23936EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 250 mm OD and 52 mm width (7.087 × 9.843 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 573 kN, C0 869 kN, Pu 57.2 kN, grease limiting speed 1,700 r/min, oil 2,100 r/min, mass about 7560 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23936EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23936EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23936EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23936EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23936EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23936EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 573 kN C / 869 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23936EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23936EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23936emkd1",
      "＊23936emkd1",
      "23936EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23036EAD1 identifies a 180×280×74 mm (7.087 × 11.024 × 2.913 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 74 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 50.0 mm radial section over the 180 mm bore carries two roller rows; capacity per millimetre of bore is about 6.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 50.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 74 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23036EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1080 kN rating no longer applies.",
      "The cylindrical-bore 23036EAD1 and its tapered-bore counterpart 23036EAKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EAD1?",
        "a": "23036EAD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23036EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23036EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23036EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036ead1",
      "＊23036ead1",
      "23036EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 180 mm shaft, NTN supplies 23036EAKD1: sphered outer raceway, two roller rows, pressed sheet-steel window cage (EA high-capacity design), oil speed 2,000 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23036EAKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 1.34 (1450/1080 kN) reflects the heavy static and shock proportioning of 23036EAKD1; size the equivalent load at the required L10 with shock factor for the application. Mount 23036EAKD1 on its adapter or withdrawal sleeve on the 180 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23036EAKD1 by envelope alone: the 1450 kN C0 and 78.6 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23036EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EAKD1?",
        "a": "23036EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23036EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23036EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23036EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036eakd1",
      "＊23036eakd1",
      "23036EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23036EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1080 kN basic dynamic capacity in a 16900 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 74 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1080 kN C and 16900 g mass the 23000 series part is built for shock and vibration; the 74 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 1,600 r/min limiting value is .80 of the 2,000 r/min oil value; heavy 74 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 23036EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 74 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23036EMD1 by envelope alone: the 1450 kN C0 and 78.6 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23036EMD1 and its tapered-bore counterpart 23036EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EMD1?",
        "a": "23036EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23036EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23036EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23036EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036emd1",
      "＊23036emd1",
      "23036EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23036EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23036EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 74,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1080,
    "static_load_kN": 1450,
    "fatigue_load_limit_kN": 78.6,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 16400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23036EMKD1 denotes the 180 mm bore spherical roller bearing (1080 kN C / 1450 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 280 mm OD / 74 mm width follow the general plan. Pu 78.6 kN is the catalogue fatigue load limit for 23036EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 50.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 74 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 23036EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23036EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23036EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1080/1450 kN ratings, 78.6 kN Pu and 16400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23036EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23036EMKD1?",
        "a": "23036EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 74 mm width (7.087 × 11.024 × 2.913 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1080 kN, C0 1450 kN, Pu 78.6 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 16400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23036EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23036EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23036EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23036EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23036EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23036EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1080 kN C / 1450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23036EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23036EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23036emkd1",
      "＊23036emkd1",
      "23036EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24036EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24036EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1880,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24036EMD1 identifies a 180×280×100 mm (7.087 × 11.024 × 3.937 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24036EMD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 180 mm bore is 7.087 in and 280 mm OD is 11.024 in; the ISO 15 envelope swaps between brands, but the 1310/1880 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 100 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 24036EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24036EMD1 by envelope alone: the 1880 kN C0 and 76 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24036EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×280 mm envelope is identical.",
      "The cylindrical-bore 24036EMD1 and its tapered-bore counterpart 24036EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The 1310/1880 kN ratings, 76 kN Pu and 22800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24036EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24036EMD1?",
        "a": "24036EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 100 mm width (7.087 × 11.024 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1880 kN, Pu 76 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24036EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24036EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24036EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24036EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24036EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24036EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24036EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24036EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24036emd1",
      "＊24036emd1",
      "24036EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24036EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24036EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 280,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1880,
    "fatigue_load_limit_kN": 76,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24036EMK30D1 belongs to the 24000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 180×280 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 180 mm bore is 7.087 in and 280 mm OD is 11.024 in; the ISO 15 envelope swaps between brands, but the 1310/1880 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 24036EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24036EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 24036EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×280 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The 1310/1880 kN ratings, 76 kN Pu and 22400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24036EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24036EMK30D1?",
        "a": "24036EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 280 mm OD and 100 mm width (7.087 × 11.024 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1880 kN, Pu 76 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24036EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 180 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24036EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24036EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24036EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24036EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24036EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24036EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24036EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24036emk30d1",
      "＊24036emk30d1",
      "24036EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EAD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 27200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23136EAD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23136EAD1 is assembled exactly in that order. Pu 88.7 kN is the catalogue fatigue load limit for 23136EAD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Selection: the C0/C ratio of 1.32 (1960/1490 kN) reflects the heavy static and shock proportioning of 23136EAD1; size the equivalent load at the required L10 with shock factor for the application. Never mount 23136EAD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 300 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1490 kN rating no longer applies.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 96 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23136EAD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 27200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EAD1?",
        "a": "23136EAD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 27200 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23136EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23136EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23136EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136ead1",
      "＊23136ead1",
      "23136EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EAKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 26400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23136EAKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 96 mm width follow the general plan. Two symmetric roller rows share the load: C 1490 kN, C0 1960 kN (C0/C ≈ 1.32), with useful axial capacity in either direction alongside the dominant radial load. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 96 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 96 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23136EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23136EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23136EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 26400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EAKD1?",
        "a": "23136EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 26400 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23136EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23136EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23136EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136eakd1",
      "＊23136eakd1",
      "23136EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 27400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 180 mm shaft, NTN supplies 23136EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,700 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23136EMD1 is assembled exactly in that order. Pu 88.7 kN is the catalogue fatigue load limit for 23136EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 96 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 23136EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23136EMD1 by envelope alone: the 1960 kN C0 and 88.7 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 96 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23136EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23136EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 27400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EMD1?",
        "a": "23136EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 27400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23136EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23136EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23136EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136emd1",
      "＊23136emd1",
      "23136EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23136EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23136EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 96,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1490,
    "static_load_kN": 1960,
    "fatigue_load_limit_kN": 88.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 26500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23136EMKD1 denotes the 180 mm bore spherical roller bearing (1490 kN C / 1960 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 180×300 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 60.0 mm radial section over the 180 mm bore carries two roller rows; capacity per millimetre of bore is about 8.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 96 mm-wide ring seats fully on both sides. Mount 23136EMKD1 on its adapter or withdrawal sleeve on the 180 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 180 mm bore 23136EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23136EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23136EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 96 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23136EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1490/1960 kN ratings, 88.7 kN Pu and 26500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23136EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23136EMKD1?",
        "a": "23136EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 96 mm width (7.087 × 11.811 × 3.78 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1490 kN, C0 1960 kN, Pu 88.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 26500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23136EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23136EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23136EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23136EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23136EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23136EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1490 kN C / 1960 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23136EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23136EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23136emkd1",
      "＊23136emkd1",
      "23136EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24136EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24136EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1660,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 85.5,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 33500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24136EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 180 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 118 mm width follow the general plan. NTN prints two speeds for 24136EMD1: 1,300 r/min grease and 1,600 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 24136EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 24136EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24136EMD1 and its tapered-bore counterpart 24136EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24136EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 24136EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1660/2290 kN ratings, 85.5 kN Pu and 33500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24136EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24136EMD1?",
        "a": "24136EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 118 mm width (7.087 × 11.811 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1660 kN, C0 2290 kN, Pu 85.5 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 33500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24136EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24136EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24136EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24136EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24136EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24136EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1660 kN C / 2290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24136EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24136EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24136emd1",
      "＊24136emd1",
      "24136EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24136EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24136EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 300,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1660,
    "static_load_kN": 2290,
    "fatigue_load_limit_kN": 85.5,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 33000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24136EMK30D1 identifies a 180×300×118 mm (7.087 × 11.811 × 4.646 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Numbering ties 24136EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 180 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1660 kN C and 33000 g mass the 24100 series part is built for shock and vibration; the 118 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 85.5 kN against C0 2290 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24136EMK30D1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24136EMK30D1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 24136EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24136EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×300 mm envelope is identical.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24136EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1660/2290 kN ratings, 85.5 kN Pu and 33000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24136EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24136EMK30D1?",
        "a": "24136EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 300 mm OD and 118 mm width (7.087 × 11.811 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1660 kN, C0 2290 kN, Pu 85.5 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 33000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24136EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 180 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24136EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24136EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24136EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24136EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24136EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1660 kN C / 2290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24136EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24136EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24136emk30d1",
      "＊24136emk30d1",
      "24136EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22236EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22236EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1450,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 29300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22236EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1450 kN basic dynamic capacity in a 29300 g, open ISO 15 envelope. Numbering ties 22236EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 180 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 22236EMD1: 1,500 r/min grease and 1,900 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Catalogue mass 29300 g (29.30 kg) for the 180×320×86 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 22236EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 180 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22236EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 86 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1450/1660 kN ratings, 101 kN Pu and 29300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22236EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22236EMD1?",
        "a": "22236EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1450 kN, C0 1660 kN, Pu 101 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 29300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22236EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22236EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22236EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22236EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22236EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22236EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1450 kN C / 1660 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22236EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22236EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22236emd1",
      "＊22236emd1",
      "22236EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22236EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22236EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 86,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1450,
    "static_load_kN": 1660,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 28700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22236EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1450 kN basic dynamic capacity in a 28700 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 86 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 22236EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 86 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 180 mm bore 22236EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1450 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22236EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 180×320 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 22236EMKD1 by envelope alone: the 1660 kN C0 and 101 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1450/1660 kN ratings, 101 kN Pu and 28700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22236EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22236EMKD1?",
        "a": "22236EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 86 mm width (7.087 × 12.598 × 3.386 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1450 kN, C0 1660 kN, Pu 101 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 28700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22236EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22236EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22236EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22236EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22236EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22236EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1450 kN C / 1660 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22236EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22236EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22236emkd1",
      "＊22236emkd1",
      "22236EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23236EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23236EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1800,
    "static_load_kN": 2270,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 38200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23236EMD1 identifies a 180×320×112 mm (7.087 × 12.598 × 4.409 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 112 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1800 kN C and 38200 g mass the 23200 series part is built for shock and vibration; the 112 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 101 kN against C0 2270 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23236EMD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 180 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 180 mm bore 23236EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23236EMD1 by envelope alone: the 2270 kN C0 and 101 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 180 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23236EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1800/2270 kN ratings, 101 kN Pu and 38200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23236EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23236EMD1?",
        "a": "23236EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 112 mm width (7.087 × 12.598 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 2270 kN, Pu 101 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 38200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23236EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23236EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23236EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23236EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23236EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23236EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1800 kN C / 2270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23236EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23236EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23236emd1",
      "＊23236emd1",
      "23236EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23236EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23236EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 320,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1800,
    "static_load_kN": 2270,
    "fatigue_load_limit_kN": 101,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 37100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23236EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 180 mm shaft — 1800 kN basic dynamic capacity in a 37100 g, open ISO 15 envelope. Numbering ties 23236EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 180 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23236EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 23236EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 112 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 180 mm bore 23236EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23236EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23236EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 112 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 112 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1800/2270 kN ratings, 101 kN Pu and 37100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23236EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23236EMKD1?",
        "a": "23236EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 320 mm OD and 112 mm width (7.087 × 12.598 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1800 kN, C0 2270 kN, Pu 101 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 37100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23236EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23236EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23236EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23236EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23236EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23236EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1800 kN C / 2270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23236EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23236EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23236emkd1",
      "＊23236emkd1",
      "23236EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22336EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22336EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2420,
    "static_load_kN": 2810,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 70200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22336EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 180 mm bore, 380 mm OD, 126 mm width, rated 1,100 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 180 mm bore; the 126 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 132 kN is the catalogue fatigue load limit for 22336EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 180 mm bore is 7.087 in and 380 mm OD is 14.961 in; the ISO 15 envelope swaps between brands, but the 2420/2810 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22336EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 180 mm bore 22336EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22336EMD1 by envelope alone: the 2810 kN C0 and 132 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22336EMD1 and its tapered-bore counterpart 22336EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2420 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22336EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2420/2810 kN ratings, 132 kN Pu and 70200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22336EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22336EMD1?",
        "a": "22336EMD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 2810 kN, Pu 132 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 70200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22336EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22336EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22336EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22336EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22336EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22336EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2420 kN C / 2810 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22336EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22336EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22336emd1",
      "＊22336emd1",
      "22336EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22336EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22336EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 180,
    "D_mm": 380,
    "B_mm": 126,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2420,
    "static_load_kN": 2810,
    "fatigue_load_limit_kN": 132,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 68700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22336EMKD1 identifies a 180×380×126 mm (7.087 × 14.961 × 4.961 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 180×380 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 2420 kN C and 68700 g mass the 22300 series part is built for shock and vibration; the 126 mm-wide ring needs square abutments to keep both rows equally loaded. 180 mm bore is 7.087 in and 380 mm OD is 14.961 in; the ISO 15 envelope swaps between brands, but the 2420/2810 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 180 mm bore 22336EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22336EMKD1 by envelope alone: the 2810 kN C0 and 132 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22336EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22336EMKD1 by envelope alone: the 2810 kN C0 and 132 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2420/2810 kN ratings, 132 kN Pu and 68700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22336EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22336EMKD1?",
        "a": "22336EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 180 mm bore, 380 mm OD and 126 mm width (7.087 × 14.961 × 4.961 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2420 kN, C0 2810 kN, Pu 132 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 68700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22336EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22336EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22336EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22336EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22336EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22336EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2420 kN C / 2810 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22336EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22336EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22336emkd1",
      "＊22336emkd1",
      "22336EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23938EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23938EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 603,
    "static_load_kN": 935,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 8200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23938EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 190×260 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. At 603 kN C and 8200 g mass the 23900 series part is built for shock and vibration; the 52 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 8200 g (8.20 kg) for the 190×260×52 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 23938EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,600 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 603/935 kN ratings, 62.8 kN Pu and 8200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23938EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23938EMD1?",
        "a": "23938EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 52 mm width (7.48 × 10.236 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 603 kN, C0 935 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 8200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23938EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23938EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23938EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23938EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23938EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23938EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 603 kN C / 935 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23938EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23938EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23938emd1",
      "＊23938emd1",
      "23938EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23938EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23938EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 260,
    "B_mm": 52,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 603,
    "static_load_kN": 935,
    "fatigue_load_limit_kN": 62.8,
    "limiting_speed_rpm": 1600,
    "max_rpm": 1600,
    "speed_oil_rpm": 2000,
    "weight_g": 7960,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23938EMKD1 denotes the 190 mm bore spherical roller bearing (603 kN C / 935 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. Numbering ties 23938EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 190 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 7960 g (7.96 kg) for the 190×260×52 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 190 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 190 mm bore 23938EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 2,000 r/min needs drain and level design; flooding the 52 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23938EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "The 603/935 kN ratings, 62.8 kN Pu and 7960 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23938EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23938EMKD1?",
        "a": "23938EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 260 mm OD and 52 mm width (7.48 × 10.236 × 2.047 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 603 kN, C0 935 kN, Pu 62.8 kN, grease limiting speed 1,600 r/min, oil 2,000 r/min, mass about 7960 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23938EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23938EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23938EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23938EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23938EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23938EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 603 kN C / 935 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23938EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23938EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23938emkd1",
      "＊23938emkd1",
      "23938EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EAD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EAD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23038EAD1 identifies a 190×290×75 mm (7.48 × 11.417 × 2.953 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (cylindrical), lubrication feature (D1); 23038EAD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EA pressed-steel-cage cage. 190 mm bore is 7.48 in and 290 mm OD is 11.417 in; the ISO 15 envelope swaps between brands, but the 1140/1570 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 75 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EAD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23038EAD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23038EAD1 by envelope alone: the 1570 kN C0 and 83.5 kN Pu are specific to the NTN EA pressed-steel-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EAD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EAD1?",
        "a": "23038EAD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17800 g. It is open, with pressed sheet-steel window cage (EA high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23038EAD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23038EAKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EAD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EAD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EAD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EAD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EAKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23038EAKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038ead1",
      "＊23038ead1",
      "23038EAD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EAKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EAKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel_stamped_J",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23038EAKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 190 mm bore, 290 mm OD, 75 mm width, rated 1,500 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EA), bore (K), lubrication feature (D1); 23038EAKD1 is assembled exactly in that order. NTN prints two speeds for 23038EAKD1: 1,500 r/min grease and 1,900 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. The 50.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 75 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 190 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EAKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23038EAKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23038EAKD1 carries EA pressed-steel-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×290 mm envelope is identical.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EAKD1 (EA pressed-steel-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EAKD1?",
        "a": "23038EAKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17300 g. It is open, with pressed sheet-steel window cage (EA high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23038EAKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23038EAD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EAKD1 is the EA pressed-steel-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EAKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EAKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EAKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EAD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23038EAD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038eakd1",
      "＊23038eakd1",
      "23038EAKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23038EMD1 identifies a 190×290×75 mm (7.48 × 11.417 × 2.953 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23038EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 190 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 1140 kN, C0 1570 kN (C0/C ≈ 1.38), with useful axial capacity in either direction alongside the dominant radial load. Grease/oil ratio: the 1,500 r/min limiting value is .79 of the 1,900 r/min oil value; heavy 75 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 23038EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23038EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23038EMD1 and its tapered-bore counterpart 23038EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 23038EMD1 by envelope alone: the 1570 kN C0 and 83.5 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EMD1?",
        "a": "23038EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23038EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23038EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23038EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038emd1",
      "＊23038emd1",
      "23038EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23038EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23038EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1140,
    "static_load_kN": 1570,
    "fatigue_load_limit_kN": 83.5,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 17400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23038EMKD1 belongs to the 23000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 290 mm OD / 75 mm width follow the general plan. The 50.0 mm radial section over the 190 mm bore carries two roller rows; capacity per millimetre of bore is about 6.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 23038EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 190 mm bore 23038EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 75 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23038EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1140/1570 kN ratings, 83.5 kN Pu and 17400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23038EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23038EMKD1?",
        "a": "23038EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 75 mm width (7.48 × 11.417 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1140 kN, C0 1570 kN, Pu 83.5 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 17400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23038EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23038EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23038EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23038EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23038EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23038EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1140 kN C / 1570 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23038EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23038EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23038emkd1",
      "＊23038emkd1",
      "23038EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24038EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24038EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 80.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 23800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24038EMD1 identifies a 190×290×100 mm (7.48 × 11.417 × 3.937 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 290 mm OD / 100 mm width follow the general plan. The cylindrical bore fits a machined 190 mm shaft seat directly; the same envelope in 24038EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 23800 g (23.80 kg) for the 190×290×100 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 24038EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 190 mm bore 24038EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1360 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24038EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 24038EMD1 by envelope alone: the 2000 kN C0 and 80.7 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24038EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×290 mm envelope is identical.",
      "The 1360/2000 kN ratings, 80.7 kN Pu and 23800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24038EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24038EMD1?",
        "a": "24038EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 100 mm width (7.48 × 11.417 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 2000 kN, Pu 80.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 23800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24038EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24038EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24038EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24038EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24038EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24038EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 2000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24038EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24038EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24038emd1",
      "＊24038emd1",
      "24038EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24038EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24038EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 290,
    "B_mm": 100,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1360,
    "static_load_kN": 2000,
    "fatigue_load_limit_kN": 80.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1700,
    "weight_g": 23400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24038EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 1360 kN basic dynamic capacity in a 23400 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 290 mm OD / 100 mm width follow the general plan. NTN prints two speeds for 24038EMK30D1: 1,300 r/min grease and 1,700 r/min oil — the gap of 400 r/min reflects oil cooling of the heavy roller set. Pu 80.7 kN against C0 2000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24038EMK30D1 moves with cleanliness far more than with small C variations. Never mount 24038EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 290 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 190 mm bore 24038EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 100 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24038EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 100 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1360/2000 kN ratings, 80.7 kN Pu and 23400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24038EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24038EMK30D1?",
        "a": "24038EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 290 mm OD and 100 mm width (7.48 × 11.417 × 3.937 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1360 kN, C0 2000 kN, Pu 80.7 kN, grease limiting speed 1,300 r/min, oil 1,700 r/min, mass about 23400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24038EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 190 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24038EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24038EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24038EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24038EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24038EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1360 kN C / 2000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24038EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24038EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24038emk30d1",
      "＊24038emk30d1",
      "24038EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23138EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23138EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2250,
    "fatigue_load_limit_kN": 100,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 34300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 190 mm shaft, NTN supplies 23138EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,600 r/min. Digit by digit the code reads as spherical-roller dimension series plus 190 mm bore; the 104 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 23138EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 23138EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 104 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23138EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1670/2250 kN ratings, 100 kN Pu and 34300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23138EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23138EMD1?",
        "a": "23138EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 104 mm width (7.48 × 12.598 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2250 kN, Pu 100 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 34300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23138EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23138EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23138EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23138EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23138EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23138EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23138EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23138EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23138emd1",
      "＊23138emd1",
      "23138EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23138EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23138EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2250,
    "fatigue_load_limit_kN": 100,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 33200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23138EMKD1 denotes the 190 mm bore spherical roller bearing (1670 kN C / 2250 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 190×320 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 190 mm bore assembly. Equivalent-load planning keeps a radial plus moderate axial combination on 23138EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23138EMKD1 on its adapter or withdrawal sleeve on the 190 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 190 mm bore 23138EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1670 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23138EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 23138EMKD1 by envelope alone: the 2250 kN C0 and 100 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23138EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×320 mm envelope is identical.",
      "The 1670/2250 kN ratings, 100 kN Pu and 33200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23138EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23138EMKD1?",
        "a": "23138EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 104 mm width (7.48 × 12.598 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2250 kN, Pu 100 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 33200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23138EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23138EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23138EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23138EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23138EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23138EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23138EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23138EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23138emkd1",
      "＊23138emkd1",
      "23138EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24138EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24138EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1900,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 96.8,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 42100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24138EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 190×320 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 1900 kN, C0 2700 kN (C0/C ≈ 1.42), with useful axial capacity in either direction alongside the dominant radial load. 190 mm bore is 7.48 in and 320 mm OD is 12.598 in; the ISO 15 envelope swaps between brands, but the 1900/2700 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 24138EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 190 mm bore 24138EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 24138EMD1 by envelope alone: the 2700 kN C0 and 96.8 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1900/2700 kN ratings, 96.8 kN Pu and 42100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24138EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24138EMD1?",
        "a": "24138EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 128 mm width (7.48 × 12.598 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1900 kN, C0 2700 kN, Pu 96.8 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 42100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24138EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24138EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24138EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24138EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24138EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24138EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1900 kN C / 2700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24138EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24138EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24138emd1",
      "＊24138emd1",
      "24138EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24138EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24138EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 320,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1900,
    "static_load_kN": 2700,
    "fatigue_load_limit_kN": 96.8,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 41500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24138EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 190 mm bore, 320 mm OD, 128 mm width, rated 1,200 r/min on grease. Reading the full code: the number gives the 190×320 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 96.8 kN is the catalogue fatigue load limit for 24138EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 65.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 128 mm-wide ring seats fully on both sides. Mount 24138EMK30D1 on its adapter or withdrawal sleeve on the 190 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 190 mm bore 24138EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24138EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24138EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24138EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1900/2700 kN ratings, 96.8 kN Pu and 41500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24138EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24138EMK30D1?",
        "a": "24138EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 320 mm OD and 128 mm width (7.48 × 12.598 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1900 kN, C0 2700 kN, Pu 96.8 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 41500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24138EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 190 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24138EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24138EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24138EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24138EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24138EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1900 kN C / 2700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24138EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24138EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24138emk30d1",
      "＊24138emk30d1",
      "24138EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22238EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22238EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1620,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 112,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 35600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22238EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 1620 kN basic dynamic capacity in a 35600 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 190 mm bore; the 92 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 1620 kN, C0 1870 kN (C0/C ≈ 1.15), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 190 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22238EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 190 mm bore 22238EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1620 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22238EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 190 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1620/1870 kN ratings, 112 kN Pu and 35600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22238EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22238EMD1?",
        "a": "22238EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1620 kN, C0 1870 kN, Pu 112 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 35600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22238EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22238EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22238EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22238EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22238EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22238EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1620 kN C / 1870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22238EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22238EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22238emd1",
      "＊22238emd1",
      "22238EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22238EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22238EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1620,
    "static_load_kN": 1870,
    "fatigue_load_limit_kN": 112,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 34900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22238EMKD1 denotes the 190 mm bore spherical roller bearing (1620 kN C / 1870 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 190 mm (two-digit code ×5, with the 00–03 exception table), and 340 mm OD / 92 mm width follow the general plan. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 8.5 kN of C per millimetre of the 190 mm bore, 22238EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 22238EMKD1 on its adapter or withdrawal sleeve on the 190 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 190 mm bore 22238EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,800 r/min needs drain and level design; flooding the 92 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1620 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 190 mm bearing, and drive-up procedures differ.",
      "The 1620/1870 kN ratings, 112 kN Pu and 34900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22238EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22238EMKD1?",
        "a": "22238EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 92 mm width (7.48 × 13.386 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1620 kN, C0 1870 kN, Pu 112 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 34900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22238EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22238EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22238EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22238EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22238EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22238EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1620 kN C / 1870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22238EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22238EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22238emkd1",
      "＊22238emkd1",
      "22238EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23238EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23238EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1990,
    "static_load_kN": 2480,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 46100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23238EMD1 identifies a 190×340×120 mm (7.48 × 13.386 × 4.724 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23238EMD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.25 (2480/1990 kN) reflects the heavy static and shock proportioning of 23238EMD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 190 mm bore 23238EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1990 kN rating no longer applies.",
      "The cylindrical-bore 23238EMD1 and its tapered-bore counterpart 23238EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23238EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23238EMD1 by envelope alone: the 2480 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1990/2480 kN ratings, 109 kN Pu and 46100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23238EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23238EMD1?",
        "a": "23238EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 120 mm width (7.48 × 13.386 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1990 kN, C0 2480 kN, Pu 109 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 46100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23238EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23238EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23238EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23238EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23238EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23238EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1990 kN C / 2480 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23238EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23238EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23238emd1",
      "＊23238emd1",
      "23238EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23238EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23238EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 340,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1990,
    "static_load_kN": 2480,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 44700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23238EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 1990 kN basic dynamic capacity in a 44700 g, open ISO 15 envelope. Numbering ties 23238EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 190 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 1,200 r/min limiting value is .80 of the 1,500 r/min oil value; heavy 120 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 120 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 190 mm bore 23238EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,500 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23238EMKD1 by envelope alone: the 2480 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23238EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1990/2480 kN ratings, 109 kN Pu and 44700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23238EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23238EMKD1?",
        "a": "23238EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 340 mm OD and 120 mm width (7.48 × 13.386 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1990 kN, C0 2480 kN, Pu 109 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 44700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23238EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23238EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23238EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23238EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23238EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23238EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1990 kN C / 2480 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23238EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23238EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23238emkd1",
      "＊23238emkd1",
      "23238EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22338EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22338EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3120,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 81500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 190 mm shaft, NTN supplies 22338EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 22338EMD1 is assembled exactly in that order. The cylindrical bore fits a machined 190 mm shaft seat directly; the same envelope in 22338EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 145 kN against C0 3120 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22338EMD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 132 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 190 mm bore 22338EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2600 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 132 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 22338EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×400 mm envelope is identical.",
      "The 2600/3120 kN ratings, 145 kN Pu and 81500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22338EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22338EMD1?",
        "a": "22338EMD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3120 kN, Pu 145 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 81500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22338EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22338EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22338EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22338EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22338EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22338EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2600 kN C / 3120 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22338EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22338EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22338emd1",
      "＊22338emd1",
      "22338EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22338EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22338EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 190,
    "D_mm": 400,
    "B_mm": 132,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2600,
    "static_load_kN": 3120,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 79900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22338EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 190 mm shaft — 2600 kN basic dynamic capacity in a 79900 g, open ISO 15 envelope. Reading the full code: the number gives the 190×400 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Pu 145 kN is the catalogue fatigue load limit for 22338EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 13.7 kN of C per millimetre of the 190 mm bore, 22338EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22338EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 190 mm bore 22338EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22338EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 190×400 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22338EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22338EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2600/3120 kN ratings, 145 kN Pu and 79900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22338EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22338EMKD1?",
        "a": "22338EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 190 mm bore, 400 mm OD and 132 mm width (7.48 × 15.748 × 5.197 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2600 kN, C0 3120 kN, Pu 145 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 79900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22338EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22338EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22338EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22338EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22338EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22338EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2600 kN C / 3120 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22338EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22338EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=211",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22338emkd1",
      "＊22338emkd1",
      "22338EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23940EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23940EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 766,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 71.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 12000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 200 mm shaft, NTN supplies 23940EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,900 r/min. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 60 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 766 kN, C0 1190 kN (C0/C ≈ 1.55), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 1,500 r/min grease limiting speed is the cage/kinematic ceiling and 1,900 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 60 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 200 mm bore 23940EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23940EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×280 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 766/1190 kN ratings, 71.8 kN Pu and 12000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23940EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23940EMD1?",
        "a": "23940EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 60 mm width (7.874 × 11.024 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 766 kN, C0 1190 kN, Pu 71.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 12000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23940EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23940EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23940EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23940EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23940EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23940EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 766 kN C / 1190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23940EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23940EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23940emd1",
      "＊23940emd1",
      "23940EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23940EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23940EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 280,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 766,
    "static_load_kN": 1190,
    "fatigue_load_limit_kN": 71.8,
    "limiting_speed_rpm": 1500,
    "max_rpm": 1500,
    "speed_oil_rpm": 1900,
    "weight_g": 11600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23940EMKD1 denotes the 200 mm bore spherical roller bearing (766 kN C / 1190 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 200×280 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 200 mm bore assembly. Catalogue mass 11600 g (11.60 kg) for the 200×280×60 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 200 mm bore 23940EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 766 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,900 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23940EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×280 mm envelope is identical.",
      "The 766/1190 kN ratings, 71.8 kN Pu and 11600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23940EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23940EMKD1?",
        "a": "23940EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 280 mm OD and 60 mm width (7.874 × 11.024 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 766 kN, C0 1190 kN, Pu 71.8 kN, grease limiting speed 1,500 r/min, oil 1,900 r/min, mass about 11600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23940EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23940EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23940EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23940EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23940EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23940EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 766 kN C / 1190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23940EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23940EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23940emkd1",
      "＊23940emkd1",
      "23940EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23040EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23040EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1790,
    "fatigue_load_limit_kN": 94.1,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23040EMD1 denotes the 200 mm bore spherical roller bearing (1310 kN C / 1790 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 200×310 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Pu 94.1 kN is the catalogue fatigue load limit for 23040EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,800 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 82 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 200 mm bore 23040EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 82 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23040EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×310 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1310/1790 kN ratings, 94.1 kN Pu and 22800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23040EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23040EMD1?",
        "a": "23040EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1790 kN, Pu 94.1 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23040EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23040EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23040EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23040EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23040EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23040EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1790 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23040EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23040EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23040emd1",
      "＊23040emd1",
      "23040EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23040EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23040EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 82,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1310,
    "static_load_kN": 1790,
    "fatigue_load_limit_kN": 94.1,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1800,
    "weight_g": 22100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 200 mm shaft, NTN supplies 23040EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,800 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23040EMKD1 is assembled exactly in that order. At 1310 kN C and 22100 g mass the 23000 series part is built for shock and vibration; the 82 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23040EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 82 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 200 mm bore 23040EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23040EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1310/1790 kN ratings, 94.1 kN Pu and 22100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23040EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23040EMKD1?",
        "a": "23040EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 82 mm width (7.874 × 12.205 × 3.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1310 kN, C0 1790 kN, Pu 94.1 kN, grease limiting speed 1,400 r/min, oil 1,800 r/min, mass about 22100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23040EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23040EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23040EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23040EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23040EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23040EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1310 kN C / 1790 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23040EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23040EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23040emkd1",
      "＊23040emkd1",
      "23040EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24040EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24040EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1570,
    "static_load_kN": 2280,
    "fatigue_load_limit_kN": 91.1,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 30200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24040EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 200 mm shaft — 1570 kN basic dynamic capacity in a 30200 g, open ISO 15 envelope. Numbering ties 24040EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 24040EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 1,200 r/min grease limiting speed is the cage/kinematic ceiling and 1,600 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 200 mm bore 24040EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24040EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 24040EMD1 and its tapered-bore counterpart 24040EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1570 kN rating no longer applies.",
      "The 1570/2280 kN ratings, 91.1 kN Pu and 30200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24040EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24040EMD1?",
        "a": "24040EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 109 mm width (7.874 × 12.205 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1570 kN, C0 2280 kN, Pu 91.1 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 30200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24040EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24040EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24040EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24040EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24040EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24040EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1570 kN C / 2280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24040EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24040EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24040emd1",
      "＊24040emd1",
      "24040EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24040EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24040EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 310,
    "B_mm": 109,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1570,
    "static_load_kN": 2280,
    "fatigue_load_limit_kN": 91.1,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1600,
    "weight_g": 29700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24040EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 200 mm shaft — 1570 kN basic dynamic capacity in a 29700 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 109 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 1570 kN C and 29700 g mass the 24000 series part is built for shock and vibration; the 109 mm-wide ring needs square abutments to keep both rows equally loaded. 200 mm bore is 7.874 in and 310 mm OD is 12.205 in; the ISO 15 envelope swaps between brands, but the 1570/2280 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 109 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 200 mm bore 24040EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24040EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24040EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 24040EMK30D1 by envelope alone: the 2280 kN C0 and 91.1 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,200 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1570/2280 kN ratings, 91.1 kN Pu and 29700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24040EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24040EMK30D1?",
        "a": "24040EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 310 mm OD and 109 mm width (7.874 × 12.205 × 4.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1570 kN, C0 2280 kN, Pu 91.1 kN, grease limiting speed 1,200 r/min, oil 1,600 r/min, mass about 29700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24040EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 200 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24040EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24040EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24040EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24040EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24040EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1570 kN C / 2280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24040EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24040EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24040emk30d1",
      "＊24040emk30d1",
      "24040EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23140EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23140EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1890,
    "static_load_kN": 2510,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 41900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23140EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 200 mm bore, 340 mm OD, 112 mm width, rated 1,100 r/min on grease. Numbering ties 23140EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 70.0 mm radial section over the 200 mm bore carries two roller rows; capacity per millimetre of bore is about 9.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 41900 g (41.90 kg) for the 200×340×112 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 112 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 200 mm bore 23140EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23140EMD1 and its tapered-bore counterpart 23140EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 1890/2510 kN ratings, 110 kN Pu and 41900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23140EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23140EMD1?",
        "a": "23140EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 112 mm width (7.874 × 13.386 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1890 kN, C0 2510 kN, Pu 110 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 41900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23140EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23140EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23140EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23140EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23140EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23140EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1890 kN C / 2510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23140EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23140EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23140emd1",
      "＊23140emd1",
      "23140EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23140EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23140EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 112,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1890,
    "static_load_kN": 2510,
    "fatigue_load_limit_kN": 110,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 40600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23140EMKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23140EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 9.4 kN of C per millimetre of the 200 mm bore, 23140EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23140EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 340 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 200 mm bore 23140EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1890 kN rating no longer applies.",
      "Never substitute 23140EMKD1 by envelope alone: the 2510 kN C0 and 110 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23140EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The 1890/2510 kN ratings, 110 kN Pu and 40600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23140EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23140EMKD1?",
        "a": "23140EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 112 mm width (7.874 × 13.386 × 4.409 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1890 kN, C0 2510 kN, Pu 110 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 40600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23140EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23140EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23140EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23140EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23140EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23140EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1890 kN C / 2510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23140EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23140EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23140emkd1",
      "＊23140emkd1",
      "23140EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24140EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24140EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2130,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 51500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 200 mm shaft, NTN supplies 24140EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,400 r/min. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 140 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 200 mm shaft seat directly; the same envelope in 24140EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 51500 g (51.50 kg) for the 200×340×140 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 200 mm bore 24140EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2130 kN rating no longer applies.",
      "Never substitute 24140EMD1 by envelope alone: the 2930 kN C0 and 105 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24140EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×340 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24140EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×340 mm envelope is identical.",
      "The 2130/2930 kN ratings, 105 kN Pu and 51500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24140EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24140EMD1?",
        "a": "24140EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 140 mm width (7.874 × 13.386 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2130 kN, C0 2930 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 51500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24140EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24140EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24140EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24140EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24140EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24140EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2130 kN C / 2930 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24140EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24140EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24140emd1",
      "＊24140emd1",
      "24140EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24140EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24140EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 340,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2130,
    "static_load_kN": 2930,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 50700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24140EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 200 mm bore, 340 mm OD, 140 mm width, rated 1,100 r/min on grease. Reading the full code: the number gives the 200×340 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 24140EMK30D1: 1,100 r/min grease and 1,400 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.38 (2930/2130 kN) reflects the heavy static and shock proportioning of 24140EMK30D1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 200 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 200 mm bore 24140EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 140 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24140EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,400 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 2130/2930 kN ratings, 105 kN Pu and 50700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24140EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24140EMK30D1?",
        "a": "24140EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 340 mm OD and 140 mm width (7.874 × 13.386 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2130 kN, C0 2930 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 50700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24140EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 200 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24140EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24140EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24140EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24140EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24140EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2130 kN C / 2930 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24140EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24140EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24140emk30d1",
      "＊24140emk30d1",
      "24140EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22240EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22240EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1810,
    "static_load_kN": 2100,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 42700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22240EMD1 denotes the 200 mm bore spherical roller bearing (1810 kN C / 2100 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 200 mm (two-digit code ×5, with the 00–03 exception table), and 360 mm OD / 98 mm width follow the general plan. Suffix reading on 22240EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 22240EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 200 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 200 mm bore 22240EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22240EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1810 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1810 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 98 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1810/2100 kN ratings, 124 kN Pu and 42700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22240EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22240EMD1?",
        "a": "22240EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1810 kN, C0 2100 kN, Pu 124 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 42700 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22240EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22240EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22240EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22240EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22240EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22240EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1810 kN C / 2100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22240EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22240EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22240emd1",
      "＊22240emd1",
      "22240EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22240EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22240EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 98,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1810,
    "static_load_kN": 2100,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 41800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22240EMKD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22240EMKD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 9.1 kN of C per millimetre of the 200 mm bore, 22240EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 200 mm bore 22240EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22240EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 22240EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×360 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22240EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×360 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22240EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1810/2100 kN ratings, 124 kN Pu and 41800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22240EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22240EMKD1?",
        "a": "22240EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 98 mm width (7.874 × 14.173 × 3.858 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1810 kN, C0 2100 kN, Pu 124 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 41800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22240EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22240EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22240EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22240EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22240EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22240EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1810 kN C / 2100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22240EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22240EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22240emkd1",
      "＊22240emkd1",
      "22240EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23240EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23240EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2250,
    "static_load_kN": 2840,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 55200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23240EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 200 mm shaft — 2250 kN basic dynamic capacity in a 55200 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 128 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 200 mm bore is 7.874 in and 360 mm OD is 14.173 in; the ISO 15 envelope swaps between brands, but the 2250/2840 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 128 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 200 mm bore 23240EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2250 kN rating no longer applies.",
      "The cylindrical-bore 23240EMD1 and its tapered-bore counterpart 23240EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23240EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23240EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 2250/2840 kN ratings, 120 kN Pu and 55200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23240EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23240EMD1?",
        "a": "23240EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 128 mm width (7.874 × 14.173 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2250 kN, C0 2840 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 55200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23240EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23240EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23240EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23240EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23240EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23240EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2250 kN C / 2840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23240EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23240EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23240emd1",
      "＊23240emd1",
      "23240EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23240EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23240EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 360,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2250,
    "static_load_kN": 2840,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1300,
    "weight_g": 53600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23240EMKD1 denotes the 200 mm bore spherical roller bearing (2250 kN C / 2840 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 200 mm bore; the 128 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 120 kN is the catalogue fatigue load limit for 23240EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 11.3 kN of C per millimetre of the 200 mm bore, 23240EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 200 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 200 mm bore 23240EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23240EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×360 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23240EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2250/2840 kN ratings, 120 kN Pu and 53600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23240EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23240EMKD1?",
        "a": "23240EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 360 mm OD and 128 mm width (7.874 × 14.173 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2250 kN, C0 2840 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,300 r/min, mass about 53600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23240EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23240EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23240EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23240EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23240EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23240EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2250 kN C / 2840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23240EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23240EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23240emkd1",
      "＊23240emkd1",
      "23240EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22340EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22340EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2830,
    "static_load_kN": 3530,
    "fatigue_load_limit_kN": 158,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1200,
    "weight_g": 94600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22340EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 200×420×138 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 200×420 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The 110.0 mm radial section over the 200 mm bore carries two roller rows; capacity per millimetre of bore is about 14.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 1.25 (3530/2830 kN) reflects the heavy static and shock proportioning of 22340EMD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 200 mm bore 22340EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 200 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 200 mm bearing, and drive-up procedures differ.",
      "Never substitute 22340EMD1 by envelope alone: the 3530 kN C0 and 158 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 22340EMD1 and its tapered-bore counterpart 22340EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2830/3530 kN ratings, 158 kN Pu and 94600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22340EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22340EMD1?",
        "a": "22340EMD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 3530 kN, Pu 158 kN, grease limiting speed 950 r/min, oil 1,200 r/min, mass about 94600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22340EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22340EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22340EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22340EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22340EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22340EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2830 kN C / 3530 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22340EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22340EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22340emd1",
      "＊22340emd1",
      "22340EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22340EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22340EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 200,
    "D_mm": 420,
    "B_mm": 138,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2830,
    "static_load_kN": 3530,
    "fatigue_load_limit_kN": 158,
    "limiting_speed_rpm": 950,
    "max_rpm": 950,
    "speed_oil_rpm": 1200,
    "weight_g": 92700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22340EMKD1 denotes the 200 mm bore spherical roller bearing (2830 kN C / 3530 kN C0) in the 22300 series, the self-aligning choice for heavy combined load. Numbering ties 22340EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 200 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 22340EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 950 r/min grease limiting speed is the cage/kinematic ceiling and 1,200 r/min is the oil-lubricated value for the 200 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 200 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 200 mm bore 22340EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22340EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×420 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22340EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 22340EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 200×420 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2830 kN rating no longer applies.",
      "The 2830/3530 kN ratings, 158 kN Pu and 92700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22340EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22340EMKD1?",
        "a": "22340EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 200 mm bore, 420 mm OD and 138 mm width (7.874 × 16.535 × 5.433 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2830 kN, C0 3530 kN, Pu 158 kN, grease limiting speed 950 r/min, oil 1,200 r/min, mass about 92700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22340EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22340EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22340EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22340EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22340EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22340EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2830 kN C / 3530 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22340EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22340EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22340emkd1",
      "＊22340emkd1",
      "22340EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23944EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23944EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 79.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 12500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23944EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 220 mm (two-digit code ×5, with the 00–03 exception table), and 300 mm OD / 60 mm width follow the general plan. The 40.0 mm radial section over the 220 mm bore carries two roller rows; capacity per millimetre of bore is about 3.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 1,400 r/min limiting value is .82 of the 1,700 r/min oil value; heavy 60 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 23944EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 220 mm bore 23944EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23944EMD1 by envelope alone: the 1260 kN C0 and 79.4 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,700 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 23944EMD1 and its tapered-bore counterpart 23944EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 23944EMD1 and its tapered-bore counterpart 23944EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 789/1260 kN ratings, 79.4 kN Pu and 12500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23944EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23944EMD1?",
        "a": "23944EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 60 mm width (8.661 × 11.811 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1260 kN, Pu 79.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 12500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23944EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23944EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23944EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23944EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23944EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23944EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23944EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23944EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23944emd1",
      "＊23944emd1",
      "23944EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23944EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23944EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 300,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 789,
    "static_load_kN": 1260,
    "fatigue_load_limit_kN": 79.4,
    "limiting_speed_rpm": 1400,
    "max_rpm": 1400,
    "speed_oil_rpm": 1700,
    "weight_g": 12100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 23944EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,700 r/min. Reading the full code: the number gives the 220×300 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. At 789 kN C and 12100 g mass the 23900 series part is built for shock and vibration; the 60 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 1,400 r/min grease limiting speed is the cage/kinematic ceiling and 1,700 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23944EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 300 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 220 mm bore 23944EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 60 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,400 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 789/1260 kN ratings, 79.4 kN Pu and 12100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23944EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23944EMKD1?",
        "a": "23944EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 300 mm OD and 60 mm width (8.661 × 11.811 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 789 kN, C0 1260 kN, Pu 79.4 kN, grease limiting speed 1,400 r/min, oil 1,700 r/min, mass about 12100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23944EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23944EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23944EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23944EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23944EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23944EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 789 kN C / 1260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23944EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23944EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23944emkd1",
      "＊23944emkd1",
      "23944EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23044EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23044EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1530,
    "static_load_kN": 2110,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 29900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23044EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 220 mm shaft — 1530 kN basic dynamic capacity in a 29900 g, open ISO 15 envelope. Reading the full code: the number gives the 220×340 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 90 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 23044EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 220 mm bore 23044EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1530 kN rating no longer applies.",
      "The cylindrical-bore 23044EMD1 and its tapered-bore counterpart 23044EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 23044EMD1 by envelope alone: the 2110 kN C0 and 109 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1530/2110 kN ratings, 109 kN Pu and 29900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23044EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23044EMD1?",
        "a": "23044EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 2110 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 29900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23044EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23044EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23044EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23044EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23044EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23044EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1530 kN C / 2110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23044EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23044EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23044emd1",
      "＊23044emd1",
      "23044EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23044EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23044EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1530,
    "static_load_kN": 2110,
    "fatigue_load_limit_kN": 109,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 29100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23044EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 220 mm bore, 340 mm OD, 90 mm width, rated 1,300 r/min on grease. Reading the full code: the number gives the 220×340 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23044EMKD1: 1,300 r/min grease and 1,600 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Pu 109 kN against C0 2110 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23044EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 220 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 220 mm bore 23044EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23044EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×340 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23044EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1530/2110 kN ratings, 109 kN Pu and 29100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23044EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23044EMKD1?",
        "a": "23044EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 90 mm width (8.661 × 13.386 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1530 kN, C0 2110 kN, Pu 109 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 29100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23044EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23044EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23044EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23044EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23044EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23044EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1530 kN C / 2110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23044EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23044EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23044emkd1",
      "＊23044emkd1",
      "23044EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24044EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24044EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1850,
    "static_load_kN": 2720,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 39200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24044EMD1 identifies a 220×340×118 mm (8.661 × 13.386 × 4.646 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24044EMD1 is assembled exactly in that order. At 1850 kN C and 39200 g mass the 24000 series part is built for shock and vibration; the 118 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 1,100 r/min limiting value is .79 of the 1,400 r/min oil value; heavy 118 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24044EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 220 mm bore 24044EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 118 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 24044EMD1 and its tapered-bore counterpart 24044EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 1,400 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1850/2720 kN ratings, 106 kN Pu and 39200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24044EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24044EMD1?",
        "a": "24044EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 118 mm width (8.661 × 13.386 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1850 kN, C0 2720 kN, Pu 106 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 39200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24044EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24044EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24044EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24044EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24044EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24044EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1850 kN C / 2720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24044EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24044EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24044emd1",
      "＊24044emd1",
      "24044EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24044EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24044EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 340,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1850,
    "static_load_kN": 2720,
    "fatigue_load_limit_kN": 106,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 38600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 24044EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,400 r/min. Reading the full code: the number gives the 220×340 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 60.0 mm radial section over the 220 mm bore carries two roller rows; capacity per millimetre of bore is about 8.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 60.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 118 mm-wide ring seats fully on both sides. Never mount 24044EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 340 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 220 mm bore 24044EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24044EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24044EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24044EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24044EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1850/2720 kN ratings, 106 kN Pu and 38600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24044EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24044EMK30D1?",
        "a": "24044EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 340 mm OD and 118 mm width (8.661 × 13.386 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1850 kN, C0 2720 kN, Pu 106 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 38600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24044EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 220 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24044EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24044EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24044EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24044EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24044EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1850 kN C / 2720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24044EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24044EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24044emk30d1",
      "＊24044emk30d1",
      "24044EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23144EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23144EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2190,
    "static_load_kN": 2940,
    "fatigue_load_limit_kN": 128,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 52300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23144EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 220 mm bore, 370 mm OD, 120 mm width, rated 1,000 r/min on grease. Numbering ties 23144EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 2190 kN, C0 2940 kN (C0/C ≈ 1.34), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 1,000 r/min grease limiting speed is the cage/kinematic ceiling and 1,300 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 220 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 220 mm bore 23144EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2190/2940 kN ratings, 128 kN Pu and 52300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23144EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23144EMD1?",
        "a": "23144EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 120 mm width (8.661 × 14.567 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2190 kN, C0 2940 kN, Pu 128 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 52300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23144EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23144EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23144EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23144EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23144EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23144EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2190 kN C / 2940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23144EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23144EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23144emd1",
      "＊23144emd1",
      "23144EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23144EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23144EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2190,
    "static_load_kN": 2940,
    "fatigue_load_limit_kN": 128,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 50700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 23144EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. Numbering ties 23144EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 75.0 mm radial section over the 220 mm bore carries two roller rows; capacity per millimetre of bore is about 10.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 128 kN against C0 2940 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23144EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 120 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 220 mm bore 23144EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 120 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23144EMKD1 by envelope alone: the 2940 kN C0 and 128 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23144EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2190/2940 kN ratings, 128 kN Pu and 50700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23144EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23144EMKD1?",
        "a": "23144EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 120 mm width (8.661 × 14.567 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2190 kN, C0 2940 kN, Pu 128 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 50700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23144EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23144EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23144EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23144EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23144EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23144EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2190 kN C / 2940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23144EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23144EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23144emkd1",
      "＊23144emkd1",
      "23144EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24144EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24144EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 3620,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 65200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 24144EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 220 mm (two-digit code ×5, with the 00–03 exception table), and 370 mm OD / 150 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Equivalent-load planning keeps a radial plus moderate axial combination on 24144EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 24144EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 220 mm bore 24144EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 24144EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "Never substitute 24144EMD1 by envelope alone: the 3620 kN C0 and 124 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2540/3620 kN ratings, 124 kN Pu and 65200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24144EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24144EMD1?",
        "a": "24144EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 150 mm width (8.661 × 14.567 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 3620 kN, Pu 124 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 65200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24144EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24144EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24144EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24144EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24144EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24144EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 3620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24144EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24144EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24144emd1",
      "＊24144emd1",
      "24144EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24144EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24144EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 370,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 3620,
    "fatigue_load_limit_kN": 124,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 64300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24144EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 220 mm shaft — 2540 kN basic dynamic capacity in a 64300 g, open ISO 15 envelope. Numbering ties 24144EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 24144EMK30D1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 220 mm bore is 8.661 in and 370 mm OD is 14.567 in; the ISO 15 envelope swaps between brands, but the 2540/3620 kN ratings and cage design are NTN 2203E values. Mount 24144EMK30D1 on its adapter or withdrawal sleeve on the 220 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 220 mm bore 24144EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2540 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24144EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 24144EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×370 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2540 kN rating no longer applies.",
      "The 2540/3620 kN ratings, 124 kN Pu and 64300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24144EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24144EMK30D1?",
        "a": "24144EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 370 mm OD and 150 mm width (8.661 × 14.567 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 3620 kN, Pu 124 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 64300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24144EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 220 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24144EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24144EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24144EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24144EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24144EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 3620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24144EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24144EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24144emk30d1",
      "＊24144emk30d1",
      "24144EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22244EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22244EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2210,
    "static_load_kN": 2690,
    "fatigue_load_limit_kN": 149,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 59600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22244EMD1 denotes the 220 mm bore spherical roller bearing (2210 kN C / 2690 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22244EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 59600 g (59.60 kg) for the 220×400×108 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22244EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 220 mm bore 22244EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22244EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22244EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22244EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 22244EMD1 by envelope alone: the 2690 kN C0 and 149 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2210/2690 kN ratings, 149 kN Pu and 59600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22244EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22244EMD1?",
        "a": "22244EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2210 kN, C0 2690 kN, Pu 149 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 59600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22244EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22244EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22244EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22244EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22244EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22244EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2210 kN C / 2690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22244EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22244EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22244emd1",
      "＊22244emd1",
      "22244EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22244EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22244EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 108,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2210,
    "static_load_kN": 2690,
    "fatigue_load_limit_kN": 149,
    "limiting_speed_rpm": 1200,
    "max_rpm": 1200,
    "speed_oil_rpm": 1500,
    "weight_g": 58400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 220 mm shaft, NTN supplies 22244EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,500 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22244EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 220 mm bore assembly. Speed planning: 1,200 r/min grease limiting speed is the cage/kinematic ceiling and 1,500 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 108 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 220 mm bore 22244EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22244EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 22244EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 220 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 22244EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "The 2210/2690 kN ratings, 149 kN Pu and 58400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22244EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22244EMKD1?",
        "a": "22244EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 108 mm width (8.661 × 15.748 × 4.252 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2210 kN, C0 2690 kN, Pu 149 kN, grease limiting speed 1,200 r/min, oil 1,500 r/min, mass about 58400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22244EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22244EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22244EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22244EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22244EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22244EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2210 kN C / 2690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22244EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22244EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22244emkd1",
      "＊22244emkd1",
      "22244EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23244EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23244EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3830,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 79400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23244EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 220 mm shaft — 2890 kN basic dynamic capacity in a 79400 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 220 mm bore; the 144 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 2890 kN C and 79400 g mass the 23200 series part is built for shock and vibration; the 144 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 79400 g (79.40 kg) for the 220×400×144 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 220 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 220 mm bore 23244EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 144 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2890 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2890/3830 kN ratings, 147 kN Pu and 79400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23244EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23244EMD1?",
        "a": "23244EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 144 mm width (8.661 × 15.748 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3830 kN, Pu 147 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 79400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23244EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23244EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23244EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23244EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23244EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23244EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23244EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23244EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23244emd1",
      "＊23244emd1",
      "23244EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23244EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23244EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 400,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3830,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1200,
    "weight_g": 77100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23244EMKD1 belongs to the 23200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 220 mm bore; the 144 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23244EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,000 r/min grease limiting speed is the cage/kinematic ceiling and 1,200 r/min is the oil-lubricated value for the 220 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23244EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 400 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 220 mm bore 23244EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23244EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 220×400 mm envelope is identical.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 144 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 144 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2890/3830 kN ratings, 147 kN Pu and 77100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23244EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23244EMKD1?",
        "a": "23244EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 400 mm OD and 144 mm width (8.661 × 15.748 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3830 kN, Pu 147 kN, grease limiting speed 1,000 r/min, oil 1,200 r/min, mass about 77100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23244EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23244EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23244EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23244EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23244EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23244EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23244EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23244EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23244emkd1",
      "＊23244emkd1",
      "23244EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22344EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22344EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3560,
    "fatigue_load_limit_kN": 163,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 119000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22344EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 220 mm bore, 460 mm OD, 145 mm width, rated 850 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 220 mm bore; the 145 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 220 mm bore is 8.661 in and 460 mm OD is 18.11 in; the ISO 15 envelope swaps between brands, but the 3010/3560 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22344EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 220 mm bore 22344EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 145 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 1,090 r/min needs drain and level design; flooding the 145 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3010 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "The 3010/3560 kN ratings, 163 kN Pu and 119000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22344EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22344EMD1?",
        "a": "22344EMD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3560 kN, Pu 163 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 119000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22344EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22344EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22344EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22344EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22344EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22344EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3560 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22344EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22344EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22344emd1",
      "＊22344emd1",
      "22344EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22344EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22344EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 220,
    "D_mm": 460,
    "B_mm": 145,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3560,
    "fatigue_load_limit_kN": 163,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 116000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22344EMKD1 belongs to the 22300 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22344EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 220 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 120.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 145 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 220 mm bore 22344EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3010 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22344EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22344EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 220 mm bearing, and drive-up procedures differ.",
      "The 3010/3560 kN ratings, 163 kN Pu and 116000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22344EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22344EMKD1?",
        "a": "22344EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 220 mm bore, 460 mm OD and 145 mm width (8.661 × 18.11 × 5.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3560 kN, Pu 163 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 116000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22344EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22344EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22344EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22344EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22344EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22344EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3560 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22344EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22344EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22344emkd1",
      "＊22344emkd1",
      "22344EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23948EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23948EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 815,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 87.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 13500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23948EMD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 320 mm OD / 60 mm width follow the general plan. Two symmetric roller rows share the load: C 815 kN, C0 1350 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. With about 3.4 kN of C per millimetre of the 240 mm bore, 23948EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23948EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23948EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23948EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 815/1350 kN ratings, 87.7 kN Pu and 13500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23948EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23948EMD1?",
        "a": "23948EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 60 mm width (9.449 × 12.598 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 815 kN, C0 1350 kN, Pu 87.7 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 13500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23948EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23948EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23948EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23948EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23948EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23948EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 815 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23948EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23948EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23948emd1",
      "＊23948emd1",
      "23948EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23948EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23948EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 320,
    "B_mm": 60,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 815,
    "static_load_kN": 1350,
    "fatigue_load_limit_kN": 87.7,
    "limiting_speed_rpm": 1300,
    "max_rpm": 1300,
    "speed_oil_rpm": 1600,
    "weight_g": 13100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23948EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 240 mm bore, 320 mm OD, 60 mm width, rated 1,300 r/min on grease. Reading the full code: the number gives the 240×320 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. NTN prints two speeds for 23948EMKD1: 1,300 r/min grease and 1,600 r/min oil — the gap of 300 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23948EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 240 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 23948EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 240 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23948EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,600 r/min needs drain and level design; flooding the 60 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 815/1350 kN ratings, 87.7 kN Pu and 13100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23948EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23948EMKD1?",
        "a": "23948EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 320 mm OD and 60 mm width (9.449 × 12.598 × 2.362 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 815 kN, C0 1350 kN, Pu 87.7 kN, grease limiting speed 1,300 r/min, oil 1,600 r/min, mass about 13100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23948EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23948EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23948EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23948EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23948EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23948EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 815 kN C / 1350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23948EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23948EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23948emkd1",
      "＊23948emkd1",
      "23948EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23048EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23048EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1630,
    "static_load_kN": 2350,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 32000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23048EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 240 mm shaft — 1630 kN basic dynamic capacity in a 32000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 240 mm bore; the 92 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 120 kN is the catalogue fatigue load limit for 23048EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 6.8 kN of C per millimetre of the 240 mm bore, 23048EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 240 mm bore 23048EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1630 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23048EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,400 r/min needs drain and level design; flooding the 92 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23048EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1630/2350 kN ratings, 120 kN Pu and 32000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23048EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23048EMD1?",
        "a": "23048EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1630 kN, C0 2350 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 32000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23048EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23048EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23048EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23048EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23048EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23048EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1630 kN C / 2350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23048EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23048EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23048emd1",
      "＊23048emd1",
      "23048EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23048EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23048EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 92,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1630,
    "static_load_kN": 2350,
    "fatigue_load_limit_kN": 120,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 31700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23048EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 240×360×92 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 240×360 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Selection: the C0/C ratio of 1.44 (2350/1630 kN) reflects the heavy static and shock proportioning of 23048EMKD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23048EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1630 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 92 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23048EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1630/2350 kN ratings, 120 kN Pu and 31700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23048EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23048EMKD1?",
        "a": "23048EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 92 mm width (9.449 × 14.173 × 3.622 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1630 kN, C0 2350 kN, Pu 120 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 31700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23048EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23048EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23048EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23048EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23048EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23048EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1630 kN C / 2350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23048EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23048EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23048emkd1",
      "＊23048emkd1",
      "23048EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24048EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24048EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1940,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 116,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 42200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24048EMD1 identifies a 240×360×118 mm (9.449 × 14.173 × 4.646 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24048EMD1 is assembled exactly in that order. Open by design, 24048EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 8.1 kN of C per millimetre of the 240 mm bore, 24048EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 240 mm bore 24048EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1940 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1940 kN rating no longer applies.",
      "The 1940/2980 kN ratings, 116 kN Pu and 42200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24048EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24048EMD1?",
        "a": "24048EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 118 mm width (9.449 × 14.173 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1940 kN, C0 2980 kN, Pu 116 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 42200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24048EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24048EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24048EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24048EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24048EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24048EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1940 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24048EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24048EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24048emd1",
      "＊24048emd1",
      "24048EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24048EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24048EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 360,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1940,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 116,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 41600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24048EMK30D1 identifies a 240×360×118 mm (9.449 × 14.173 × 4.646 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24048EMK30D1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Pu 116 kN against C0 2980 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24048EMK30D1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24048EMK30D1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 240 mm bore 24048EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 24048EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×360 mm envelope is identical.",
      "Never substitute 24048EMK30D1 by envelope alone: the 2980 kN C0 and 116 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1940/2980 kN ratings, 116 kN Pu and 41600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24048EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24048EMK30D1?",
        "a": "24048EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 360 mm OD and 118 mm width (9.449 × 14.173 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1940 kN, C0 2980 kN, Pu 116 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 41600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24048EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 240 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24048EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24048EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24048EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24048EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24048EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1940 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24048EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24048EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24048emk30d1",
      "＊24048emk30d1",
      "24048EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23148EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23148EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2510,
    "static_load_kN": 3500,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 65100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 240 mm shaft, NTN supplies 23148EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,200 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23148EMD1 is assembled exactly in that order. The 80.0 mm radial section over the 240 mm bore carries two roller rows; capacity per millimetre of bore is about 10.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Grease/oil ratio: the 960 r/min limiting value is .80 of the 1,200 r/min oil value; heavy 128 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 23148EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 23148EMD1 and its tapered-bore counterpart 23148EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 23148EMD1 and its tapered-bore counterpart 23148EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2510/3500 kN ratings, 147 kN Pu and 65100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23148EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23148EMD1?",
        "a": "23148EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 128 mm width (9.449 × 15.748 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2510 kN, C0 3500 kN, Pu 147 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 65100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23148EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23148EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23148EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23148EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23148EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23148EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2510 kN C / 3500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23148EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23148EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23148emd1",
      "＊23148emd1",
      "23148EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23148EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23148EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2510,
    "static_load_kN": 3500,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 63100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23148EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 240×400×128 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23148EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 240 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 80.0 mm radial section over the 240 mm bore carries two roller rows; capacity per millimetre of bore is about 10.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 128 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23148EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 128 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23148EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×400 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 128 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23148EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2510/3500 kN ratings, 147 kN Pu and 63100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23148EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23148EMKD1?",
        "a": "23148EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 128 mm width (9.449 × 15.748 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2510 kN, C0 3500 kN, Pu 147 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 63100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23148EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23148EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23148EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23148EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23148EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23148EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2510 kN C / 3500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23148EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23148EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23148emkd1",
      "＊23148emkd1",
      "23148EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24148EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24148EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2910,
    "static_load_kN": 4290,
    "fatigue_load_limit_kN": 142,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 81000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24148EMD1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 400 mm OD / 160 mm width follow the general plan. Suffix reading on 24148EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 240 mm bore is 9.449 in and 400 mm OD is 15.748 in; the ISO 15 envelope swaps between brands, but the 2910/4290 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 240 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 24148EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24148EMD1 by envelope alone: the 4290 kN C0 and 142 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 24148EMD1 and its tapered-bore counterpart 24148EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2910/4290 kN ratings, 142 kN Pu and 81000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24148EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24148EMD1?",
        "a": "24148EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 160 mm width (9.449 × 15.748 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2910 kN, C0 4290 kN, Pu 142 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 81000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24148EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24148EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24148EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24148EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24148EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24148EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2910 kN C / 4290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24148EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24148EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24148emd1",
      "＊24148emd1",
      "24148EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24148EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24148EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 400,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2910,
    "static_load_kN": 4290,
    "fatigue_load_limit_kN": 142,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 79800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 240 mm shaft, NTN supplies 24148EMK30D1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,200 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 400 mm OD / 160 mm width follow the general plan. Two symmetric roller rows share the load: C 2910 kN, C0 4290 kN (C0/C ≈ 1.47), with useful axial capacity in either direction alongside the dominant radial load. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 160 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 240 mm bore 24148EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24148EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 160 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 240 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2910/4290 kN ratings, 142 kN Pu and 79800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24148EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24148EMK30D1?",
        "a": "24148EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 400 mm OD and 160 mm width (9.449 × 15.748 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2910 kN, C0 4290 kN, Pu 142 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 79800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24148EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 240 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24148EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24148EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24148EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24148EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24148EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2910 kN C / 4290 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24148EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24148EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24148emk30d1",
      "＊24148emk30d1",
      "24148EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22248EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22248EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2470,
    "static_load_kN": 3110,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1060,
    "max_rpm": 1060,
    "speed_oil_rpm": 1350,
    "weight_g": 82600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22248EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 240 mm shaft — 2470 kN basic dynamic capacity in a 82600 g, open ISO 15 envelope. Numbering ties 22248EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 240 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22248EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Speed planning: 1,060 r/min grease limiting speed is the cage/kinematic ceiling and 1,350 r/min is the oil-lubricated value for the 240 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 22248EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 440 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 240 mm bore 22248EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2470 kN rating no longer applies.",
      "Never substitute 22248EMD1 by envelope alone: the 3110 kN C0 and 159 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 240 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 120 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2470/3110 kN ratings, 159 kN Pu and 82600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22248EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22248EMD1?",
        "a": "22248EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2470 kN, C0 3110 kN, Pu 159 kN, grease limiting speed 1,060 r/min, oil 1,350 r/min, mass about 82600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22248EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22248EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22248EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22248EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22248EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22248EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2470 kN C / 3110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22248EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22248EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22248emd1",
      "＊22248emd1",
      "22248EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22248EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22248EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 120,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2470,
    "static_load_kN": 3110,
    "fatigue_load_limit_kN": 159,
    "limiting_speed_rpm": 1060,
    "max_rpm": 1060,
    "speed_oil_rpm": 1350,
    "weight_g": 80900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22248EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 240 mm bore, 440 mm OD, 120 mm width, rated 1,060 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 22248EMKD1 is assembled exactly in that order. NTN prints two speeds for 22248EMKD1: 1,060 r/min grease and 1,350 r/min oil — the gap of 290 r/min reflects oil cooling of the heavy roller set. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 120 mm-wide ring seats fully on both sides. Mount 22248EMKD1 on its adapter or withdrawal sleeve on the 240 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 240 mm bore 22248EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,060 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22248EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "Never substitute 22248EMKD1 by envelope alone: the 3110 kN C0 and 159 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,350 r/min needs drain and level design; flooding the 120 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 2470/3110 kN ratings, 159 kN Pu and 80900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22248EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22248EMKD1?",
        "a": "22248EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 120 mm width (9.449 × 17.323 × 4.724 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2470 kN, C0 3110 kN, Pu 159 kN, grease limiting speed 1,060 r/min, oil 1,350 r/min, mass about 80900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22248EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22248EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22248EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22248EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22248EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22248EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2470 kN C / 3110 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22248EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22248EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22248emkd1",
      "＊22248emkd1",
      "22248EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23248EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23248EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3140,
    "static_load_kN": 4260,
    "fatigue_load_limit_kN": 156,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 108000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23248EMD1 identifies a 240×440×160 mm (9.449 × 17.323 × 6.299 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 240 mm (two-digit code ×5, with the 00–03 exception table), and 440 mm OD / 160 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 240 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 240 mm bore 23248EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23248EMD1 by envelope alone: the 4260 kN C0 and 156 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 23248EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23248EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23248EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3140/4260 kN ratings, 156 kN Pu and 108000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23248EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23248EMD1?",
        "a": "23248EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 160 mm width (9.449 × 17.323 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3140 kN, C0 4260 kN, Pu 156 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 108000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23248EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23248EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23248EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23248EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23248EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23248EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3140 kN C / 4260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23248EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23248EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23248emd1",
      "＊23248emd1",
      "23248EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23248EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23248EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 440,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3140,
    "static_load_kN": 4260,
    "fatigue_load_limit_kN": 156,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23248EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 240 mm bore, 440 mm OD, 160 mm width, rated 850 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 240 mm bore; the 160 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 240 mm bore assembly. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Mount 23248EMKD1 on its adapter or withdrawal sleeve on the 240 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 240 mm bore 23248EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23248EMKD1 by envelope alone: the 4260 kN C0 and 156 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23248EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 850 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23248EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 240×440 mm envelope is identical.",
      "The 3140/4260 kN ratings, 156 kN Pu and 105000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23248EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23248EMKD1?",
        "a": "23248EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 440 mm OD and 160 mm width (9.449 × 17.323 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3140 kN, C0 4260 kN, Pu 156 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 105000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23248EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23248EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23248EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23248EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23248EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23248EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3140 kN C / 4260 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23248EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23248EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23248emkd1",
      "＊23248emkd1",
      "23248EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22348EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22348EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3500,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 149000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22348EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 240 mm bore, 500 mm OD, 155 mm width, rated 780 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 240 mm bore; the 155 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 130.0 mm radial section over the 240 mm bore carries two roller rows; capacity per millimetre of bore is about 14.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 149000 g (149.00 kg) for the 240×500×155 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 155 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 240 mm bore 22348EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 155 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22348EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22348EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 22348EMD1 and its tapered-bore counterpart 22348EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 3500/4170 kN ratings, 193 kN Pu and 149000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22348EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22348EMD1?",
        "a": "22348EMD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3500 kN, C0 4170 kN, Pu 193 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 149000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22348EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22348EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22348EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22348EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22348EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22348EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3500 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22348EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22348EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22348emd1",
      "＊22348emd1",
      "22348EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22348EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22348EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 240,
    "D_mm": 500,
    "B_mm": 155,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3500,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 146000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 240 mm shaft, NTN supplies 22348EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,000 r/min. Numbering ties 22348EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 240 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 3500 kN C and 146000 g mass the 22300 series part is built for shock and vibration; the 155 mm-wide ring needs square abutments to keep both rows equally loaded. 240 mm bore is 9.449 in and 500 mm OD is 19.685 in; the ISO 15 envelope swaps between brands, but the 3500/4170 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 155 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 240 mm bore 22348EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 155 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22348EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 22348EMKD1 by envelope alone: the 4170 kN C0 and 193 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 780 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 3500/4170 kN ratings, 193 kN Pu and 146000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22348EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22348EMKD1?",
        "a": "22348EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 240 mm bore, 500 mm OD and 155 mm width (9.449 × 19.685 × 6.102 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3500 kN, C0 4170 kN, Pu 193 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 146000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22348EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22348EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22348EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22348EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22348EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22348EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3500 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22348EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22348EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22348emkd1",
      "＊22348emkd1",
      "22348EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23952EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23952EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1940,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 23900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 260 mm shaft, NTN supplies 23952EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,400 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 360 mm OD / 75 mm width follow the general plan. At 1130 kN C and 23900 g mass the 23900 series part is built for shock and vibration; the 75 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 1,100 r/min limiting value is .79 of the 1,400 r/min oil value; heavy 75 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 23952EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 75 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23952EMD1 by envelope alone: the 1940 kN C0 and 105 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23952EMD1 and its tapered-bore counterpart 23952EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1130/1940 kN ratings, 105 kN Pu and 23900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23952EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23952EMD1?",
        "a": "23952EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 75 mm width (10.236 × 14.173 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1940 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 23900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23952EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23952EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23952EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23952EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23952EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23952EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1130 kN C / 1940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23952EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23952EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23952emd1",
      "＊23952emd1",
      "23952EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23952EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23952EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 360,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1130,
    "static_load_kN": 1940,
    "fatigue_load_limit_kN": 105,
    "limiting_speed_rpm": 1100,
    "max_rpm": 1100,
    "speed_oil_rpm": 1400,
    "weight_g": 23100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23952EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×360×75 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23952EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1130 kN C and 23100 g mass the 23900 series part is built for shock and vibration; the 75 mm-wide ring needs square abutments to keep both rows equally loaded. With about 4.3 kN of C per millimetre of the 260 mm bore, 23952EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23952EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 260 mm bore 23952EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,100 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1130/1940 kN ratings, 105 kN Pu and 23100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23952EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23952EMKD1?",
        "a": "23952EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 360 mm OD and 75 mm width (10.236 × 14.173 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1130 kN, C0 1940 kN, Pu 105 kN, grease limiting speed 1,100 r/min, oil 1,400 r/min, mass about 23100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23952EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23952EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23952EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23952EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23952EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23952EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1130 kN C / 1940 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23952EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23952EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23952emkd1",
      "＊23952emkd1",
      "23952EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23052EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23052EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2060,
    "static_load_kN": 2910,
    "fatigue_load_limit_kN": 144,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 47800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23052EMD1 denotes the 260 mm bore spherical roller bearing (2060 kN C / 2910 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 260×400 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.41 (2910/2060 kN) reflects the heavy static and shock proportioning of 23052EMD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 104 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 260 mm bore 23052EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23052EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 104 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 104 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23052EMD1 by envelope alone: the 2910 kN C0 and 144 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2060/2910 kN ratings, 144 kN Pu and 47800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23052EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23052EMD1?",
        "a": "23052EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2060 kN, C0 2910 kN, Pu 144 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 47800 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23052EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23052EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23052EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23052EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23052EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23052EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2060 kN C / 2910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23052EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23052EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23052emd1",
      "＊23052emd1",
      "23052EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23052EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23052EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 104,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2060,
    "static_load_kN": 2910,
    "fatigue_load_limit_kN": 144,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 46300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23052EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 260 mm shaft — 2060 kN basic dynamic capacity in a 46300 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 400 mm OD / 104 mm width follow the general plan. At 2060 kN C and 46300 g mass the 23000 series part is built for shock and vibration; the 104 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23052EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 260 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 260 mm bore 23052EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23052EMKD1 by envelope alone: the 2910 kN C0 and 144 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23052EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2060/2910 kN ratings, 144 kN Pu and 46300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23052EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23052EMKD1?",
        "a": "23052EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 104 mm width (10.236 × 15.748 × 4.094 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2060 kN, C0 2910 kN, Pu 144 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 46300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23052EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23052EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23052EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23052EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23052EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23052EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2060 kN C / 2910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23052EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23052EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23052emkd1",
      "＊23052emkd1",
      "23052EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24052EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24052EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2520,
    "static_load_kN": 3820,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 63600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24052EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 260 mm shaft — 2520 kN basic dynamic capacity in a 63600 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24052EMD1 is assembled exactly in that order. The cylindrical bore fits a machined 260 mm shaft seat directly; the same envelope in 24052EMK30D1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Grease/oil ratio: the 960 r/min limiting value is .80 of the 1,200 r/min oil value; heavy 140 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 24052EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 400 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 260 mm bore 24052EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 24052EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×400 mm envelope is identical.",
      "The 2520/3820 kN ratings, 139 kN Pu and 63600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24052EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24052EMD1?",
        "a": "24052EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 140 mm width (10.236 × 15.748 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2520 kN, C0 3820 kN, Pu 139 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 63600 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24052EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24052EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24052EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24052EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24052EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24052EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2520 kN C / 3820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24052EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24052EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24052emd1",
      "＊24052emd1",
      "24052EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24052EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24052EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 400,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2520,
    "static_load_kN": 3820,
    "fatigue_load_limit_kN": 139,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 62600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24052EMK30D1 with a 1:30 tapered bore (K30) and D1 outer-ring annular oil groove with holes: 260 mm bore, 400 mm OD, 140 mm width, rated 960 r/min on grease. Reading the full code: the number gives the 260×400 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Two symmetric roller rows share the load: C 2520 kN, C0 3820 kN (C0/C ≈ 1.52), with useful axial capacity in either direction alongside the dominant radial load. Pu 139 kN against C0 3820 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24052EMK30D1 moves with cleanliness far more than with small C variations. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 260 mm bore 24052EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24052EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 24052EMK30D1 by envelope alone: the 3820 kN C0 and 139 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2520/3820 kN ratings, 139 kN Pu and 62600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24052EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24052EMK30D1?",
        "a": "24052EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 400 mm OD and 140 mm width (10.236 × 15.748 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2520 kN, C0 3820 kN, Pu 139 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 62600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24052EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 260 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24052EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24052EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24052EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24052EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24052EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2520 kN C / 3820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24052EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24052EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24052emk30d1",
      "＊24052emk30d1",
      "24052EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23152EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23152EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2780,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1090,
    "weight_g": 92200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23152EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 260 mm bore, 440 mm OD, 144 mm width, rated 860 r/min on grease. Numbering ties 23152EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 860 r/min grease limiting speed is the cage/kinematic ceiling and 1,090 r/min is the oil-lubricated value for the 260 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 23152EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23152EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23152EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×440 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23152EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×440 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23152EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 2780/4020 kN ratings, 160 kN Pu and 92200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23152EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23152EMD1?",
        "a": "23152EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 144 mm width (10.236 × 17.323 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2780 kN, C0 4020 kN, Pu 160 kN, grease limiting speed 860 r/min, oil 1,090 r/min, mass about 92200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23152EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23152EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23152EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23152EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23152EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23152EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2780 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23152EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23152EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23152emd1",
      "＊23152emd1",
      "23152EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23152EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23152EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 144,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2780,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 160,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1090,
    "weight_g": 89500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23152EMKD1 identifies a 260×440×144 mm (10.236 × 17.323 × 5.669 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 144 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23152EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 260 mm bore is 10.236 in and 440 mm OD is 17.323 in; the ISO 15 envelope swaps between brands, but the 2780/4020 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 144 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 260 mm bore 23152EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 860 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 23152EMKD1 by envelope alone: the 4020 kN C0 and 160 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 144 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2780/4020 kN ratings, 160 kN Pu and 89500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23152EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23152EMKD1?",
        "a": "23152EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 144 mm width (10.236 × 17.323 × 5.669 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2780 kN, C0 4020 kN, Pu 160 kN, grease limiting speed 860 r/min, oil 1,090 r/min, mass about 89500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23152EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23152EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23152EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23152EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23152EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23152EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2780 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23152EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23152EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23152emkd1",
      "＊23152emkd1",
      "23152EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24152EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24152EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3290,
    "static_load_kN": 4880,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 111000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 260 mm shaft, NTN supplies 24152EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,090 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 440 mm OD / 180 mm width follow the general plan. Two symmetric roller rows share the load: C 3290 kN, C0 4880 kN (C0/C ≈ 1.48), with useful axial capacity in either direction alongside the dominant radial load. The 90.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 180 mm-wide ring seats fully on both sides. Never mount 24152EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 440 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 260 mm bore 24152EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3290 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24152EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 24152EMD1 and its tapered-bore counterpart 24152EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 3290/4880 kN ratings, 147 kN Pu and 111000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24152EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24152EMD1?",
        "a": "24152EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 180 mm width (10.236 × 17.323 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3290 kN, C0 4880 kN, Pu 147 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 111000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24152EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24152EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24152EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24152EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24152EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24152EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3290 kN C / 4880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24152EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24152EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24152emd1",
      "＊24152emd1",
      "24152EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24152EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24152EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 440,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3290,
    "static_load_kN": 4880,
    "fatigue_load_limit_kN": 147,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1090,
    "weight_g": 109000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24152EMK30D1 denotes the 260 mm bore spherical roller bearing (3290 kN C / 4880 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. Numbering ties 24152EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 90.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 180 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 24152EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 24152EMK30D1 by envelope alone: the 4880 kN C0 and 147 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24152EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "The 3290/4880 kN ratings, 147 kN Pu and 109000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24152EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24152EMK30D1?",
        "a": "24152EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 440 mm OD and 180 mm width (10.236 × 17.323 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3290 kN, C0 4880 kN, Pu 147 kN, grease limiting speed 850 r/min, oil 1,090 r/min, mass about 109000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24152EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 260 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24152EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24152EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24152EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24152EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24152EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3290 kN C / 4880 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24152EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24152EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24152emk30d1",
      "＊24152emk30d1",
      "24152EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22252EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22252EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3680,
    "fatigue_load_limit_kN": 183,
    "limiting_speed_rpm": 970,
    "max_rpm": 970,
    "speed_oil_rpm": 1240,
    "weight_g": 108000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22252EMD1 denotes the 260 mm bore spherical roller bearing (2890 kN C / 3680 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22252EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 260 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 2890 kN, C0 3680 kN (C0/C ≈ 1.27), with useful axial capacity in either direction alongside the dominant radial load. With about 11.1 kN of C per millimetre of the 260 mm bore, 22252EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 260 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 260 mm bore 22252EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22252EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 130 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 2890/3680 kN ratings, 183 kN Pu and 108000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22252EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22252EMD1?",
        "a": "22252EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3680 kN, Pu 183 kN, grease limiting speed 970 r/min, oil 1,240 r/min, mass about 108000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22252EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22252EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22252EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22252EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22252EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22252EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3680 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22252EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22252EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22252emd1",
      "＊22252emd1",
      "22252EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22252EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22252EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2890,
    "static_load_kN": 3680,
    "fatigue_load_limit_kN": 183,
    "limiting_speed_rpm": 970,
    "max_rpm": 970,
    "speed_oil_rpm": 1240,
    "weight_g": 105000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22252EMKD1 identifies a 260×480×130 mm (10.236 × 18.898 × 5.118 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 260 mm (two-digit code ×5, with the 00–03 exception table), and 480 mm OD / 130 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 11.1 kN of C per millimetre of the 260 mm bore, 22252EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 130 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 260 mm bore 22252EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 22252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 22252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22252EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 2890/3680 kN ratings, 183 kN Pu and 105000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22252EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22252EMKD1?",
        "a": "22252EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 130 mm width (10.236 × 18.898 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2890 kN, C0 3680 kN, Pu 183 kN, grease limiting speed 970 r/min, oil 1,240 r/min, mass about 105000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22252EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22252EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22252EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22252EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22252EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22252EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2890 kN C / 3680 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22252EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22252EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22252emkd1",
      "＊22252emkd1",
      "22252EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23252EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23252EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 174,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3650,
    "static_load_kN": 5050,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 143000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23252EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 260 mm shaft — 3650 kN basic dynamic capacity in a 143000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 174 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 143000 g (143.00 kg) for the 260×480×174 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 260 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 260 mm bore 23252EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23252EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "Never substitute 23252EMD1 by envelope alone: the 5050 kN C0 and 180 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 3650/5050 kN ratings, 180 kN Pu and 143000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23252EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23252EMD1?",
        "a": "23252EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 174 mm width (10.236 × 18.898 × 6.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 5050 kN, Pu 180 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 143000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23252EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23252EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23252EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23252EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23252EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23252EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 5050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23252EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23252EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23252emd1",
      "＊23252emd1",
      "23252EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23252EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23252EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 480,
    "B_mm": 174,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3650,
    "static_load_kN": 5050,
    "fatigue_load_limit_kN": 180,
    "limiting_speed_rpm": 780,
    "max_rpm": 780,
    "speed_oil_rpm": 1000,
    "weight_g": 139000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23252EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×480×174 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23252EMKD1 is assembled exactly in that order. Pu 180 kN is the catalogue fatigue load limit for 23252EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 14.0 kN of C per millimetre of the 260 mm bore, 23252EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23252EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 480 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 260 mm bore 23252EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23252EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 260×480 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 260 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23252EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3650/5050 kN ratings, 180 kN Pu and 139000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23252EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23252EMKD1?",
        "a": "23252EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 480 mm OD and 174 mm width (10.236 × 18.898 × 6.85 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 5050 kN, Pu 180 kN, grease limiting speed 780 r/min, oil 1,000 r/min, mass about 139000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23252EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23252EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23252EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23252EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23252EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23252EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 5050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23252EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23252EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23252emkd1",
      "＊23252emkd1",
      "23252EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22352EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22352EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 4830,
    "fatigue_load_limit_kN": 221,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 186000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22352EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×540×165 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 165 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 260 mm bore is 10.236 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 4020/4830 kN ratings and cage design are NTN 2203E values. Never mount 22352EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 260 mm bore 22352EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 22352EMD1 by envelope alone: the 4830 kN C0 and 221 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4020 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22352EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4020/4830 kN ratings, 221 kN Pu and 186000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22352EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22352EMD1?",
        "a": "22352EMD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 4830 kN, Pu 221 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 186000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22352EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22352EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22352EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22352EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22352EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22352EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 4830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22352EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22352EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22352emd1",
      "＊22352emd1",
      "22352EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22352EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22352EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 260,
    "D_mm": 540,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 4830,
    "fatigue_load_limit_kN": 221,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 183000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22352EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 260×540×165 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Digit by digit the code reads as spherical-roller dimension series plus 260 mm bore; the 165 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 4020 kN, C0 4830 kN (C0/C ≈ 1.20), with useful axial capacity in either direction alongside the dominant radial load. Pu 221 kN against C0 4830 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22352EMKD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 260 mm bore 22352EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22352EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22352EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22352EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 260 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The 4020/4830 kN ratings, 221 kN Pu and 183000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22352EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22352EMKD1?",
        "a": "22352EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 260 mm bore, 540 mm OD and 165 mm width (10.236 × 21.26 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 4830 kN, Pu 221 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 183000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22352EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22352EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22352EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22352EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22352EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22352EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 4830 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22352EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22352EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22352emkd1",
      "＊22352emkd1",
      "22352EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23956EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23956EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 2050,
    "fatigue_load_limit_kN": 115,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 25200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 280 mm shaft, NTN supplies 23956EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,300 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 380 mm OD / 75 mm width follow the general plan. Open by design, 23956EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 4.2 kN of C per millimetre of the 280 mm bore, 23956EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 280 mm bore 23956EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,300 r/min needs drain and level design; flooding the 75 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1180 kN rating no longer applies.",
      "The 1180/2050 kN ratings, 115 kN Pu and 25200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23956EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23956EMD1?",
        "a": "23956EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 75 mm width (11.024 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 2050 kN, Pu 115 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 25200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23956EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23956EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23956EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23956EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23956EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23956EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 2050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23956EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23956EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23956emd1",
      "＊23956emd1",
      "23956EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23956EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23956EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 380,
    "B_mm": 75,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1180,
    "static_load_kN": 2050,
    "fatigue_load_limit_kN": 115,
    "limiting_speed_rpm": 1000,
    "max_rpm": 1000,
    "speed_oil_rpm": 1300,
    "weight_g": 24400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23956EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 1180 kN basic dynamic capacity in a 24400 g, open ISO 15 envelope. Numbering ties 23956EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 280 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 1180 kN C and 24400 g mass the 23900 series part is built for shock and vibration; the 75 mm-wide ring needs square abutments to keep both rows equally loaded. Speed planning: 1,000 r/min grease limiting speed is the cage/kinematic ceiling and 1,300 r/min is the oil-lubricated value for the 280 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 280 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 280 mm bore 23956EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 280 mm bearing, and drive-up procedures differ.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 1,000 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1180/2050 kN ratings, 115 kN Pu and 24400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23956EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23956EMKD1?",
        "a": "23956EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 380 mm OD and 75 mm width (11.024 × 14.961 × 2.953 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1180 kN, C0 2050 kN, Pu 115 kN, grease limiting speed 1,000 r/min, oil 1,300 r/min, mass about 24400 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23956EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23956EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23956EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23956EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23956EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23956EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1180 kN C / 2050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23956EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23956EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23956emkd1",
      "＊23956emkd1",
      "23956EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23056EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23056EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2170,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 155,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 51300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23056EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 2170 kN basic dynamic capacity in a 51300 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 106 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 23056EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 280 mm bore is 11.024 in and 420 mm OD is 16.535 in; the ISO 15 envelope swaps between brands, but the 2170/3150 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 23056EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 280 mm bore 23056EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 960 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2170/3150 kN ratings, 155 kN Pu and 51300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23056EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23056EMD1?",
        "a": "23056EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2170 kN, C0 3150 kN, Pu 155 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 51300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23056EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23056EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23056EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23056EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23056EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23056EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2170 kN C / 3150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23056EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23056EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23056emd1",
      "＊23056emd1",
      "23056EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23056EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23056EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2170,
    "static_load_kN": 3150,
    "fatigue_load_limit_kN": 155,
    "limiting_speed_rpm": 960,
    "max_rpm": 960,
    "speed_oil_rpm": 1200,
    "weight_g": 49700,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23056EMKD1 denotes the 280 mm bore spherical roller bearing (2170 kN C / 3150 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 420 mm OD / 106 mm width follow the general plan. Open by design, 23056EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 280 mm bore is 11.024 in and 420 mm OD is 16.535 in; the ISO 15 envelope swaps between brands, but the 2170/3150 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 280 mm bore 23056EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23056EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Oil relubrication toward 1,200 r/min needs drain and level design; flooding the 106 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2170 kN rating no longer applies.",
      "The 2170/3150 kN ratings, 155 kN Pu and 49700 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23056EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23056EMKD1?",
        "a": "23056EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 106 mm width (11.024 × 16.535 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2170 kN, C0 3150 kN, Pu 155 kN, grease limiting speed 960 r/min, oil 1,200 r/min, mass about 49700 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23056EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23056EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23056EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23056EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23056EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23056EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2170 kN C / 3150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23056EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23056EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=212",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23056emkd1",
      "＊23056emkd1",
      "23056EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24056EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24056EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2620,
    "static_load_kN": 4060,
    "fatigue_load_limit_kN": 150,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1100,
    "weight_g": 67300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24056EMD1 identifies a 280×420×140 mm (11.024 × 16.535 × 5.512 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24056EMD1 is assembled exactly in that order. Pu 150 kN is the catalogue fatigue load limit for 24056EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 9.4 kN of C per millimetre of the 280 mm bore, 24056EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 140 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 280 mm bore 24056EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24056EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×420 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2620/4060 kN ratings, 150 kN Pu and 67300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24056EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24056EMD1?",
        "a": "24056EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 140 mm width (11.024 × 16.535 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2620 kN, C0 4060 kN, Pu 150 kN, grease limiting speed 880 r/min, oil 1,100 r/min, mass about 67300 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24056EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24056EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24056EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24056EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24056EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24056EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2620 kN C / 4060 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24056EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24056EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24056emd1",
      "＊24056emd1",
      "24056EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24056EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24056EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 420,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2620,
    "static_load_kN": 4060,
    "fatigue_load_limit_kN": 150,
    "limiting_speed_rpm": 880,
    "max_rpm": 880,
    "speed_oil_rpm": 1100,
    "weight_g": 66300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24056EMK30D1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 2620 kN basic dynamic capacity in a 66300 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24056EMK30D1 is assembled exactly in that order. Pu 150 kN is the catalogue fatigue load limit for 24056EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 280 mm bore is 11.024 in and 420 mm OD is 16.535 in; the ISO 15 envelope swaps between brands, but the 2620/4060 kN ratings and cage design are NTN 2203E values. Mount 24056EMK30D1 on its adapter or withdrawal sleeve on the 280 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 280 mm bore 24056EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 880 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24056EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2620/4060 kN ratings, 150 kN Pu and 66300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24056EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24056EMK30D1?",
        "a": "24056EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 420 mm OD and 140 mm width (11.024 × 16.535 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2620 kN, C0 4060 kN, Pu 150 kN, grease limiting speed 880 r/min, oil 1,100 r/min, mass about 66300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24056EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 280 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24056EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24056EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24056EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24056EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24056EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2620 kN C / 4060 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24056EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24056EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24056emk30d1",
      "＊24056emk30d1",
      "24056EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23156EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23156EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2980,
    "static_load_kN": 4400,
    "fatigue_load_limit_kN": 182,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 98400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23156EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 280 mm bore, 460 mm OD, 146 mm width, rated 810 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23156EMD1 is assembled exactly in that order. At 2980 kN C and 98400 g mass the 23100 series part is built for shock and vibration; the 146 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 810 r/min limiting value is .79 of the 1,030 r/min oil value; heavy 146 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 280 mm bore 23156EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23156EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×460 mm envelope is identical.",
      "Never substitute 23156EMD1 by envelope alone: the 4400 kN C0 and 182 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 23156EMD1 and its tapered-bore counterpart 23156EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 810 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 2980/4400 kN ratings, 182 kN Pu and 98400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23156EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23156EMD1?",
        "a": "23156EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 146 mm width (11.024 × 18.11 × 5.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2980 kN, C0 4400 kN, Pu 182 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 98400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23156EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23156EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23156EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23156EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23156EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23156EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2980 kN C / 4400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23156EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23156EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23156emd1",
      "＊23156emd1",
      "23156EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23156EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23156EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 146,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2980,
    "static_load_kN": 4400,
    "fatigue_load_limit_kN": 182,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 95300,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23156EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 2980 kN basic dynamic capacity in a 95300 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 146 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 90.0 mm radial section over the 280 mm bore carries two roller rows; capacity per millimetre of bore is about 10.6 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 182 kN against C0 4400 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23156EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 280 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 280 mm bore 23156EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Never substitute 23156EMKD1 by envelope alone: the 4400 kN C0 and 182 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 1,030 r/min needs drain and level design; flooding the 146 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23156EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2980/4400 kN ratings, 182 kN Pu and 95300 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23156EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23156EMKD1?",
        "a": "23156EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 146 mm width (11.024 × 18.11 × 5.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2980 kN, C0 4400 kN, Pu 182 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 95300 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23156EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23156EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23156EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23156EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23156EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23156EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2980 kN C / 4400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23156EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23156EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23156emkd1",
      "＊23156emkd1",
      "23156EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24156EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24156EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3550,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 118000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 280 mm shaft, NTN supplies 24156EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,030 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 460 mm OD / 180 mm width follow the general plan. Suffix reading on 24156EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 810 r/min limiting value is .79 of the 1,030 r/min oil value; heavy 180 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 24156EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 280 mm bore 24156EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24156EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×460 mm envelope is identical.",
      "Oil relubrication toward 1,030 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3550/5450 kN ratings, 167 kN Pu and 118000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24156EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24156EMD1?",
        "a": "24156EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 180 mm width (11.024 × 18.11 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3550 kN, C0 5450 kN, Pu 167 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 118000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24156EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24156EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24156EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24156EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24156EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24156EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3550 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24156EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24156EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24156emd1",
      "＊24156emd1",
      "24156EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24156EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24156EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 460,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3550,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 167,
    "limiting_speed_rpm": 810,
    "max_rpm": 810,
    "speed_oil_rpm": 1030,
    "weight_g": 117000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24156EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 280×460×180 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 460 mm OD / 180 mm width follow the general plan. Pu 167 kN is the catalogue fatigue load limit for 24156EMK30D1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Pu 167 kN against C0 5450 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24156EMK30D1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 280 mm bore 24156EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,030 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 24156EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×460 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24156EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3550/5450 kN ratings, 167 kN Pu and 117000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24156EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24156EMK30D1?",
        "a": "24156EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 460 mm OD and 180 mm width (11.024 × 18.11 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3550 kN, C0 5450 kN, Pu 167 kN, grease limiting speed 810 r/min, oil 1,030 r/min, mass about 117000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24156EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 280 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24156EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24156EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24156EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24156EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24156EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3550 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24156EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24156EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24156emk30d1",
      "＊24156emk30d1",
      "24156EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22256EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22256EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3920,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1180,
    "weight_g": 113000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22256EMD1 denotes the 280 mm bore spherical roller bearing (3010 kN C / 3920 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Numbering ties 22256EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 280 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 22256EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 198 kN against C0 3920 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22256EMD1 moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 22256EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 280 mm bore 22256EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 920 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 22256EMD1 and its tapered-bore counterpart 22256EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 22256EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 130 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3010/3920 kN ratings, 198 kN Pu and 113000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22256EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22256EMD1?",
        "a": "22256EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3920 kN, Pu 198 kN, grease limiting speed 920 r/min, oil 1,180 r/min, mass about 113000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22256EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22256EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22256EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22256EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22256EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22256EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3920 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22256EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22256EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22256emd1",
      "＊22256emd1",
      "22256EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22256EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22256EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 130,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3010,
    "static_load_kN": 3920,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 920,
    "max_rpm": 920,
    "speed_oil_rpm": 1180,
    "weight_g": 111000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22256EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 3010 kN basic dynamic capacity in a 111000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 280 mm (two-digit code ×5, with the 00–03 exception table), and 500 mm OD / 130 mm width follow the general plan. At 3010 kN C and 111000 g mass the 22200 series part is built for shock and vibration; the 130 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 198 kN against C0 3920 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22256EMKD1 moves with cleanliness far more than with small C variations. Mount 22256EMKD1 on its adapter or withdrawal sleeve on the 280 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 280 mm bore 22256EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 22256EMKD1 by envelope alone: the 3920 kN C0 and 198 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 22256EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22256EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 920 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 3010/3920 kN ratings, 198 kN Pu and 111000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22256EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22256EMKD1?",
        "a": "22256EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 130 mm width (11.024 × 19.685 × 5.118 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3010 kN, C0 3920 kN, Pu 198 kN, grease limiting speed 920 r/min, oil 1,180 r/min, mass about 111000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22256EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22256EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22256EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22256EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22256EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22256EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3010 kN C / 3920 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22256EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22256EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22256emkd1",
      "＊22256emkd1",
      "22256EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23256EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23256EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3770,
    "static_load_kN": 5340,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 740,
    "max_rpm": 740,
    "speed_oil_rpm": 950,
    "weight_g": 152000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23256EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 280 mm shaft — 3770 kN basic dynamic capacity in a 152000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 176 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 193 kN is the catalogue fatigue load limit for 23256EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 740 r/min grease limiting speed is the cage/kinematic ceiling and 950 r/min is the oil-lubricated value for the 280 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 280 mm bore 23256EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23256EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 176 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23256EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23256EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3770/5340 kN ratings, 193 kN Pu and 152000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23256EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23256EMD1?",
        "a": "23256EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 176 mm width (11.024 × 19.685 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3770 kN, C0 5340 kN, Pu 193 kN, grease limiting speed 740 r/min, oil 950 r/min, mass about 152000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23256EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23256EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23256EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23256EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23256EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23256EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3770 kN C / 5340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23256EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23256EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23256emd1",
      "＊23256emd1",
      "23256EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23256EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23256EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 500,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3770,
    "static_load_kN": 5340,
    "fatigue_load_limit_kN": 193,
    "limiting_speed_rpm": 740,
    "max_rpm": 740,
    "speed_oil_rpm": 950,
    "weight_g": 148000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23256EMKD1 identifies a 280×500×176 mm (11.024 × 19.685 × 6.929 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23256EMKD1 is assembled exactly in that order. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 280 mm bore assembly. Pu 193 kN against C0 5340 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23256EMKD1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 176 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 280 mm bore 23256EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3770 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23256EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 280 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K seats.",
      "Do not confuse EA and EM at the same number: 23256EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×500 mm envelope is identical.",
      "The 3770/5340 kN ratings, 193 kN Pu and 148000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23256EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23256EMKD1?",
        "a": "23256EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 500 mm OD and 176 mm width (11.024 × 19.685 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3770 kN, C0 5340 kN, Pu 193 kN, grease limiting speed 740 r/min, oil 950 r/min, mass about 148000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23256EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23256EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23256EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23256EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23256EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23256EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3770 kN C / 5340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23256EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23256EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23256emkd1",
      "＊23256emkd1",
      "23256EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22356EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22356EMD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4490,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 249,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 228000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 22356EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 280 mm bore, 580 mm OD, 175 mm width, rated 670 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 175 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 22356EMD1: 670 r/min grease and 860 r/min oil — the gap of 190 r/min reflects oil cooling of the heavy roller set. Catalogue mass 228000 g (228.00 kg) for the 280×580×175 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 175 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 280 mm bore 22356EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22356EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 280×580 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 280 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 22356EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 860 r/min needs drain and level design; flooding the 175 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4490/5450 kN ratings, 249 kN Pu and 228000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22356EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22356EMD1?",
        "a": "22356EMD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4490 kN, C0 5450 kN, Pu 249 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 228000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22356EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22356EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22356EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22356EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22356EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22356EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4490 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22356EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22356EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22356emd1",
      "＊22356emd1",
      "22356EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22356EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22356EMKD1",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 280,
    "D_mm": 580,
    "B_mm": 175,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4490,
    "static_load_kN": 5450,
    "fatigue_load_limit_kN": 249,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 223000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22356EMKD1 identifies a 280×580×175 mm (11.024 × 22.835 × 6.89 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 280 mm bore; the 175 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 150.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 175 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 175 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 280 mm bore 22356EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 670 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22356EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22356EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 280 mm bearing, and drive-up procedures differ.",
      "The 4490/5450 kN ratings, 249 kN Pu and 223000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22356EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22356EMKD1?",
        "a": "22356EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 280 mm bore, 580 mm OD and 175 mm width (11.024 × 22.835 × 6.89 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4490 kN, C0 5450 kN, Pu 249 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 223000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22356EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22356EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22356EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22356EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22356EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22356EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4490 kN C / 5450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22356EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22356EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22356emkd1",
      "＊22356emkd1",
      "22356EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23960EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23960EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1600,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1140,
    "weight_g": 40100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 300 mm shaft, NTN supplies 23960EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,140 r/min. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 23960EMD1: 890 r/min grease and 1,140 r/min oil — the gap of 250 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.64 (2620/1600 kN) reflects the heavy static and shock proportioning of 23960EMD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 90 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 23960EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23960EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1600 kN rating no longer applies.",
      "Oil relubrication toward 1,140 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 1,140 r/min needs drain and level design; flooding the 90 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1600/2620 kN ratings, 145 kN Pu and 40100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23960EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23960EMD1?",
        "a": "23960EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 90 mm width (11.811 × 16.535 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1600 kN, C0 2620 kN, Pu 145 kN, grease limiting speed 890 r/min, oil 1,140 r/min, mass about 40100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23960EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23960EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23960EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23960EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23960EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23960EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1600 kN C / 2620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23960EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23960EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23960emd1",
      "＊23960emd1",
      "23960EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23960EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23960EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 420,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1600,
    "static_load_kN": 2620,
    "fatigue_load_limit_kN": 145,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1140,
    "weight_g": 39200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23960EMKD1 denotes the 300 mm bore spherical roller bearing (1600 kN C / 2620 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23960EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23960EMKD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 23960EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23960EMKD1 by envelope alone: the 2620 kN C0 and 145 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 890 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23960EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×420 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "The 1600/2620 kN ratings, 145 kN Pu and 39200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23960EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23960EMKD1?",
        "a": "23960EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 420 mm OD and 90 mm width (11.811 × 16.535 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1600 kN, C0 2620 kN, Pu 145 kN, grease limiting speed 890 r/min, oil 1,140 r/min, mass about 39200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23960EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23960EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23960EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23960EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23960EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23960EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1600 kN C / 2620 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23960EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23960EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23960emkd1",
      "＊23960emkd1",
      "23960EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23060EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23060EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2400,
    "static_load_kN": 3610,
    "fatigue_load_limit_kN": 176,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1130,
    "weight_g": 72900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23060EMD1 denotes the 300 mm bore spherical roller bearing (2400 kN C / 3610 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 300×460 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 23060EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Selection: the C0/C ratio of 1.50 (3610/2400 kN) reflects the heavy static and shock proportioning of 23060EMD1; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 300 mm bore 23060EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,130 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Oil relubrication toward 1,130 r/min needs drain and level design; flooding the 118 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2400 kN rating no longer applies.",
      "The 2400/3610 kN ratings, 176 kN Pu and 72900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23060EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23060EMD1?",
        "a": "23060EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2400 kN, C0 3610 kN, Pu 176 kN, grease limiting speed 890 r/min, oil 1,130 r/min, mass about 72900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23060EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23060EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23060EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23060EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23060EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23060EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2400 kN C / 3610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23060EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23060EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23060emd1",
      "＊23060emd1",
      "23060EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23060EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23060EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2400,
    "static_load_kN": 3610,
    "fatigue_load_limit_kN": 176,
    "limiting_speed_rpm": 890,
    "max_rpm": 890,
    "speed_oil_rpm": 1130,
    "weight_g": 70900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 300 mm shaft, NTN supplies 23060EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,130 r/min. Reading the full code: the number gives the 300×460 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Speed planning: 890 r/min grease limiting speed is the cage/kinematic ceiling and 1,130 r/min is the oil-lubricated value for the 300 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 300 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 300 mm bore 23060EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2400 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 890 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "The 2400/3610 kN ratings, 176 kN Pu and 70900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23060EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23060EMKD1?",
        "a": "23060EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 118 mm width (11.811 × 18.11 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2400 kN, C0 3610 kN, Pu 176 kN, grease limiting speed 890 r/min, oil 1,130 r/min, mass about 70900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23060EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23060EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23060EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23060EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23060EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23060EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2400 kN C / 3610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23060EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23060EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23060emkd1",
      "＊23060emkd1",
      "23060EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24060EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24060EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3150,
    "static_load_kN": 5190,
    "fatigue_load_limit_kN": 166,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 98000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24060EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 300 mm shaft — 3150 kN basic dynamic capacity in a 98000 g, open ISO 15 envelope. Numbering ties 24060EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 300 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Selection: the C0/C ratio of 1.65 (5190/3150 kN) reflects the heavy static and shock proportioning of 24060EMD1; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 300 mm bore 24060EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24060EMD1 by envelope alone: the 5190 kN C0 and 166 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 24060EMD1 by envelope alone: the 5190 kN C0 and 166 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 24060EMD1 by envelope alone: the 5190 kN C0 and 166 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 3150/5190 kN ratings, 166 kN Pu and 98000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24060EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24060EMD1?",
        "a": "24060EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 160 mm width (11.811 × 18.11 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3150 kN, C0 5190 kN, Pu 166 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 98000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24060EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24060EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24060EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24060EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24060EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24060EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3150 kN C / 5190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24060EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24060EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24060emd1",
      "＊24060emd1",
      "24060EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24060EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24060EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 460,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3150,
    "static_load_kN": 5190,
    "fatigue_load_limit_kN": 166,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 96900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24060EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 300×460×160 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 300×460 mm envelope, EM names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Suffix reading on 24060EMK30D1: EM identifies the high-capacity execution with a one-piece machined brass cage; K30 marks the 1:30 tapered bore of the wide series; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 300 mm bore is 11.811 in and 460 mm OD is 18.11 in; the ISO 15 envelope swaps between brands, but the 3150/5190 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24060EMK30D1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 300 mm bore 24060EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24060EMK30D1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3150/5190 kN ratings, 166 kN Pu and 96900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24060EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24060EMK30D1?",
        "a": "24060EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 460 mm OD and 160 mm width (11.811 × 18.11 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3150 kN, C0 5190 kN, Pu 166 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 96900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24060EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 300 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24060EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24060EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24060EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24060EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24060EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3150 kN C / 5190 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24060EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24060EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24060emk30d1",
      "＊24060emk30d1",
      "24060EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23160EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23160EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3540,
    "static_load_kN": 5170,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 129000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23160EMD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 300×500×160 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 23160EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 300 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 205 kN against C0 5170 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23160EMD1 moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 23160EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 300 mm bore 23160EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23160EMD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 160 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 23160EMD1 and its tapered-bore counterpart 23160EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23160EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3540/5170 kN ratings, 205 kN Pu and 129000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23160EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23160EMD1?",
        "a": "23160EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 160 mm width (11.811 × 19.685 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3540 kN, C0 5170 kN, Pu 205 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 129000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23160EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23160EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23160EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23160EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23160EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23160EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3540 kN C / 5170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23160EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23160EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23160emd1",
      "＊23160emd1",
      "23160EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23160EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23160EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3540,
    "static_load_kN": 5170,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 125000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23160EMKD1 belongs to the 23100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23160EMKD1 is assembled exactly in that order. Pu 205 kN is the catalogue fatigue load limit for 23160EMKD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 160 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 300 mm bore 23160EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23160EMKD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23160EMKD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23160EMKD1 by envelope alone: the 5170 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23160EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3540/5170 kN ratings, 205 kN Pu and 125000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23160EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23160EMKD1?",
        "a": "23160EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 160 mm width (11.811 × 19.685 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3540 kN, C0 5170 kN, Pu 205 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 125000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23160EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23160EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23160EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23160EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23160EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23160EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3540 kN C / 5170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23160EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23160EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23160emkd1",
      "＊23160emkd1",
      "23160EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24160EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24160EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4270,
    "static_load_kN": 6610,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 159000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24160EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 300 mm bore, 500 mm OD, 200 mm width, rated 750 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 200 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 24160EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 750 r/min grease limiting speed is the cage/kinematic ceiling and 950 r/min is the oil-lubricated value for the 300 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 200 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 300 mm bore 24160EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24160EMD1 and its tapered-bore counterpart 24160EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24160EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 24160EMD1 and its tapered-bore counterpart 24160EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4270 kN rating no longer applies.",
      "The 4270/6610 kN ratings, 198 kN Pu and 159000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24160EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24160EMD1?",
        "a": "24160EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 200 mm width (11.811 × 19.685 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4270 kN, C0 6610 kN, Pu 198 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 159000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24160EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24160EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24160EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24160EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24160EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24160EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4270 kN C / 6610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24160EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24160EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24160emd1",
      "＊24160emd1",
      "24160EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24160EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24160EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 500,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4270,
    "static_load_kN": 6610,
    "fatigue_load_limit_kN": 198,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 157000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24160EMK30D1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 24160EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 300 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 100.0 mm radial section over the 300 mm bore carries two roller rows; capacity per millimetre of bore is about 14.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 198 kN against C0 6610 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24160EMK30D1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 200 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 300 mm bore 24160EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 950 r/min needs drain and level design; flooding the 200 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "Never substitute 24160EMK30D1 by envelope alone: the 6610 kN C0 and 198 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24160EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4270/6610 kN ratings, 198 kN Pu and 157000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24160EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24160EMK30D1?",
        "a": "24160EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 500 mm OD and 200 mm width (11.811 × 19.685 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4270 kN, C0 6610 kN, Pu 198 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 157000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24160EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 300 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24160EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24160EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24160EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24160EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24160EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4270 kN C / 6610 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24160EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24160EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24160emk30d1",
      "＊24160emk30d1",
      "24160EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22260EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22260EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3470,
    "static_load_kN": 4590,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1080,
    "weight_g": 134000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22260EMD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (22200 series); the bore code resolves to 300 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 140 mm width follow the general plan. Open by design, 22260EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 860 r/min limiting value is .80 of the 1,080 r/min oil value; heavy 140 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 300 mm bore 22260EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,080 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3470 kN rating no longer applies.",
      "The 3470/4590 kN ratings, 232 kN Pu and 134000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22260EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22260EMD1?",
        "a": "22260EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3470 kN, C0 4590 kN, Pu 232 kN, grease limiting speed 860 r/min, oil 1,080 r/min, mass about 134000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22260EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22260EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22260EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22260EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22260EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22260EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3470 kN C / 4590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22260EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22260EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22260emd1",
      "＊22260emd1",
      "22260EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22260EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22260EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3470,
    "static_load_kN": 4590,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 860,
    "max_rpm": 860,
    "speed_oil_rpm": 1080,
    "weight_g": 131000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 22260EMKD1 denotes the 300 mm bore spherical roller bearing (3470 kN C / 4590 kN C0) in the 22200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 300×540 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 22260EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 22260EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 300 mm bore 22260EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 22260EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×540 mm envelope is identical.",
      "Never substitute 22260EMKD1 by envelope alone: the 4590 kN C0 and 232 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3470 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22260EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3470/4590 kN ratings, 232 kN Pu and 131000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22260EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22260EMKD1?",
        "a": "22260EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 140 mm width (11.811 × 21.26 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3470 kN, C0 4590 kN, Pu 232 kN, grease limiting speed 860 r/min, oil 1,080 r/min, mass about 131000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22260EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22260EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22260EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22260EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22260EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22260EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3470 kN C / 4590 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22260EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22260EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22260emkd1",
      "＊22260emkd1",
      "22260EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23260EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23260EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4520,
    "static_load_kN": 6280,
    "fatigue_load_limit_kN": 228,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 194000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23260EMD1 denotes the 300 mm bore spherical roller bearing (4520 kN C / 6280 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 192 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. With about 15.1 kN of C per millimetre of the 300 mm bore, 23260EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 23260EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 23260EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23260EMD1 and its tapered-bore counterpart 23260EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 23260EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×540 mm envelope is identical.",
      "Never substitute 23260EMD1 by envelope alone: the 6280 kN C0 and 228 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 4520/6280 kN ratings, 228 kN Pu and 194000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23260EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23260EMD1?",
        "a": "23260EMD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 192 mm width (11.811 × 21.26 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4520 kN, C0 6280 kN, Pu 228 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 194000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23260EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23260EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23260EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23260EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23260EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23260EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4520 kN C / 6280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23260EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23260EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23260emd1",
      "＊23260emd1",
      "23260EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23260EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23260EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 540,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4520,
    "static_load_kN": 6280,
    "fatigue_load_limit_kN": 228,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 188000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23260EMKD1 denotes the 300 mm bore spherical roller bearing (4520 kN C / 6280 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 300 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 192 mm width follow the general plan. NTN prints two speeds for 23260EMKD1: 690 r/min grease and 880 r/min oil — the gap of 190 r/min reflects oil cooling of the heavy roller set. Equivalent-load planning keeps a radial plus moderate axial combination on 23260EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Never mount 23260EMKD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 300 mm bore 23260EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23260EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 23260EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 300×540 mm envelope is identical.",
      "Never substitute 23260EMKD1 by envelope alone: the 6280 kN C0 and 228 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 192 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4520/6280 kN ratings, 228 kN Pu and 188000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23260EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23260EMKD1?",
        "a": "23260EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 540 mm OD and 192 mm width (11.811 × 21.26 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4520 kN, C0 6280 kN, Pu 228 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 188000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23260EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23260EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23260EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23260EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23260EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23260EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4520 kN C / 6280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23260EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23260EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23260emkd1",
      "＊23260emkd1",
      "23260EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22360B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22360B",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 620,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 550,
    "max_rpm": 550,
    "speed_oil_rpm": 720,
    "weight_g": 270000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 300 mm shaft, NTN supplies 22360B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 720 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 22360B is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 270000 g (270.00 kg) for the 300×620×185 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 300 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 300 mm bore 22360B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 22360B and its tapered-bore counterpart 22360BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4000 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 550 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22360B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4000/5400 kN ratings, 490 kN Pu and 270000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22360B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22360B?",
        "a": "22360B is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 620 mm OD and 185 mm width (11.811 × 24.409 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 5400 kN, Pu 490 kN, grease limiting speed 550 r/min, oil 720 r/min, mass about 270000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22360B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22360BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22360B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 22360B?",
        "a": "22360B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 22360B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22360BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22360BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22360b",
      "22360B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22360BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22360BK",
    "series": "22300-series",
    "type": "spherical_roller",
    "d_mm": 300,
    "D_mm": 620,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 550,
    "max_rpm": 550,
    "speed_oil_rpm": 720,
    "weight_g": 265000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 22360BK identifies a 300×620×185 mm (11.811 × 24.409 × 7.283 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 300 mm bore; the 185 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 160.0 mm radial section over the 300 mm bore carries two roller rows; capacity per millimetre of bore is about 13.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 160.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 185 mm-wide ring seats fully on both sides. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 300 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 300 mm bore 22360BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22360B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 300 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 300 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22360B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4000/5400 kN ratings, 490 kN Pu and 265000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22360BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22360BK?",
        "a": "22360BK is an NTN double-row spherical roller bearing to ISO 15: 300 mm bore, 620 mm OD and 185 mm width (11.811 × 24.409 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 5400 kN, Pu 490 kN, grease limiting speed 550 r/min, oil 720 r/min, mass about 265000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22360BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22360B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22360BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 22360BK?",
        "a": "22360BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 22360BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22300 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22360B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22300-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22360B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22360bk",
      "22360BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23964EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23964EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2820,
    "fatigue_load_limit_kN": 154,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 1080,
    "weight_g": 42100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 23964EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,080 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 440 mm OD / 90 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 320 mm bore is 12.598 in and 440 mm OD is 17.323 in; the ISO 15 envelope swaps between brands, but the 1670/2820 kN ratings and cage design are NTN 2203E values. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 320 mm bore 23964EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23964EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×440 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23964EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23964EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1670/2820 kN ratings, 154 kN Pu and 42100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23964EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23964EMD1?",
        "a": "23964EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 90 mm width (12.598 × 17.323 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2820 kN, Pu 154 kN, grease limiting speed 840 r/min, oil 1,080 r/min, mass about 42100 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23964EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23964EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23964EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23964EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23964EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23964EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23964EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23964EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23964emd1",
      "＊23964emd1",
      "23964EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23964EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23964EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 440,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1670,
    "static_load_kN": 2820,
    "fatigue_load_limit_kN": 154,
    "limiting_speed_rpm": 840,
    "max_rpm": 840,
    "speed_oil_rpm": 1080,
    "weight_g": 40800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 23964EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,080 r/min. Digit by digit the code reads as spherical-roller dimension series plus 320 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 5.2 kN of C per millimetre of the 320 mm bore, 23964EMKD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 320 mm bore 23964EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23964EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 1670/2820 kN ratings, 154 kN Pu and 40800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23964EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23964EMKD1?",
        "a": "23964EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 440 mm OD and 90 mm width (12.598 × 17.323 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1670 kN, C0 2820 kN, Pu 154 kN, grease limiting speed 840 r/min, oil 1,080 r/min, mass about 40800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23964EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23964EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23964EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23964EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23964EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23964EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1670 kN C / 2820 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23964EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23964EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23964emkd1",
      "＊23964emkd1",
      "23964EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23064EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23064EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1070,
    "weight_g": 78900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23064EMD1 denotes the 320 mm bore spherical roller bearing (2540 kN C / 4020 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 320×480 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23064EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 320 mm bore 23064EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 2540/4020 kN ratings, 191 kN Pu and 78900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23064EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23064EMD1?",
        "a": "23064EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 4020 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,070 r/min, mass about 78900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23064EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23064EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23064EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23064EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23064EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23064EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23064EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23064EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23064emd1",
      "＊23064emd1",
      "23064EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23064EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23064EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 121,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2540,
    "static_load_kN": 4020,
    "fatigue_load_limit_kN": 191,
    "limiting_speed_rpm": 850,
    "max_rpm": 850,
    "speed_oil_rpm": 1070,
    "weight_g": 76600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23064EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 320 mm bore, 480 mm OD, 121 mm width, rated 850 r/min on grease. Reading the full code: the number gives the 320×480 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The 80.0 mm radial section over the 320 mm bore carries two roller rows; capacity per millimetre of bore is about 7.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 121 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 320 mm bore 23064EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 121 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23064EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 2540/4020 kN ratings, 191 kN Pu and 76600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23064EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23064EMKD1?",
        "a": "23064EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 121 mm width (12.598 × 18.898 × 4.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2540 kN, C0 4020 kN, Pu 191 kN, grease limiting speed 850 r/min, oil 1,070 r/min, mass about 76600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23064EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23064EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23064EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23064EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23064EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23064EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2540 kN C / 4020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23064EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23064EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23064emkd1",
      "＊23064emkd1",
      "23064EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24064EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24064EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3250,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 184,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 104000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24064EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 320 mm shaft — 3250 kN basic dynamic capacity in a 104000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24064EMD1 is assembled exactly in that order. Two symmetric roller rows share the load: C 3250 kN, C0 5400 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. With about 10.2 kN of C per millimetre of the 320 mm bore, 24064EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 24064EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 320 mm bore 24064EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24064EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 3250/5400 kN ratings, 184 kN Pu and 104000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24064EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24064EMD1?",
        "a": "24064EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 160 mm width (12.598 × 18.898 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3250 kN, C0 5400 kN, Pu 184 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 104000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24064EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24064EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24064EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24064EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24064EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24064EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3250 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24064EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24064EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24064emd1",
      "＊24064emd1",
      "24064EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24064EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24064EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 480,
    "B_mm": 160,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3250,
    "static_load_kN": 5400,
    "fatigue_load_limit_kN": 184,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 920,
    "weight_g": 102000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24064EMK30D1 denotes the 320 mm bore spherical roller bearing (3250 kN C / 5400 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24064EMK30D1 is assembled exactly in that order. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 320 mm bore assembly. The 80.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 160 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 320 mm bore 24064EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24064EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×480 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24064EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 24064EMK30D1 by envelope alone: the 5400 kN C0 and 184 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24064EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×480 mm envelope is identical.",
      "The 3250/5400 kN ratings, 184 kN Pu and 102000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24064EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24064EMK30D1?",
        "a": "24064EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 480 mm OD and 160 mm width (12.598 × 18.898 × 6.299 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3250 kN, C0 5400 kN, Pu 184 kN, grease limiting speed 720 r/min, oil 920 r/min, mass about 102000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24064EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 320 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24064EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24064EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24064EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24064EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24064EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3250 kN C / 5400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24064EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24064EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24064emk30d1",
      "＊24064emk30d1",
      "24064EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23164EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23164EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 6020,
    "fatigue_load_limit_kN": 227,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "speed_oil_rpm": 880,
    "weight_g": 169000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23164EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 320 mm bore, 540 mm OD, 176 mm width, rated 700 r/min on grease. Numbering ties 23164EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 320 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. NTN prints two speeds for 23164EMD1: 700 r/min grease and 880 r/min oil — the gap of 180 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.50 (6020/4020 kN) reflects the heavy static and shock proportioning of 23164EMD1; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 320 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 320 mm bore 23164EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23164EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4020 kN rating no longer applies.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 176 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 176 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4020/6020 kN ratings, 227 kN Pu and 169000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23164EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23164EMD1?",
        "a": "23164EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 176 mm width (12.598 × 21.26 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 6020 kN, Pu 227 kN, grease limiting speed 700 r/min, oil 880 r/min, mass about 169000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23164EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23164EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23164EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23164EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23164EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23164EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 6020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23164EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23164EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23164emd1",
      "＊23164emd1",
      "23164EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23164EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23164EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 176,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4020,
    "static_load_kN": 6020,
    "fatigue_load_limit_kN": 227,
    "limiting_speed_rpm": 700,
    "max_rpm": 700,
    "speed_oil_rpm": 880,
    "weight_g": 164000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 23164EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 880 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23164EMKD1 is assembled exactly in that order. Suffix reading on 23164EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 320 mm bore is 12.598 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 4020/6020 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 320 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 320 mm bore 23164EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23164EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23164EMKD1 by envelope alone: the 6020 kN C0 and 227 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 176 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4020/6020 kN ratings, 227 kN Pu and 164000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23164EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23164EMKD1?",
        "a": "23164EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 176 mm width (12.598 × 21.26 × 6.929 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4020 kN, C0 6020 kN, Pu 227 kN, grease limiting speed 700 r/min, oil 880 r/min, mass about 164000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23164EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23164EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23164EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23164EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23164EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23164EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4020 kN C / 6020 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23164EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23164EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23164emkd1",
      "＊23164emkd1",
      "23164EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24164EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24164EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5010,
    "static_load_kN": 7720,
    "fatigue_load_limit_kN": 225,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 204000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 24164EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 880 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 218 mm width follow the general plan. At 5010 kN C and 204000 g mass the 24100 series part is built for shock and vibration; the 218 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 690 r/min limiting value is .78 of the 880 r/min oil value; heavy 218 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fit the cylindrical-bore 24164EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 320 mm bore 24164EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The cylindrical-bore 24164EMD1 and its tapered-bore counterpart 24164EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 880 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 690 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 5010/7720 kN ratings, 225 kN Pu and 204000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24164EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24164EMD1?",
        "a": "24164EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 218 mm width (12.598 × 21.26 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5010 kN, C0 7720 kN, Pu 225 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 204000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24164EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24164EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24164EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24164EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24164EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24164EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5010 kN C / 7720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24164EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24164EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24164emd1",
      "＊24164emd1",
      "24164EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24164EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24164EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 540,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5010,
    "static_load_kN": 7720,
    "fatigue_load_limit_kN": 225,
    "limiting_speed_rpm": 690,
    "max_rpm": 690,
    "speed_oil_rpm": 880,
    "weight_g": 201000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24164EMK30D1 identifies a 320×540×218 mm (12.598 × 21.26 × 8.583 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 218 mm width follow the general plan. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 320 mm bore assembly. 320 mm bore is 12.598 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 5010/7720 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 218 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 320 mm bore 24164EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5010 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24164EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 24164EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×540 mm envelope is identical.",
      "The 5010/7720 kN ratings, 225 kN Pu and 201000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24164EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24164EMK30D1?",
        "a": "24164EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 540 mm OD and 218 mm width (12.598 × 21.26 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5010 kN, C0 7720 kN, Pu 225 kN, grease limiting speed 690 r/min, oil 880 r/min, mass about 201000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24164EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 320 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24164EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24164EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24164EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24164EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24164EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5010 kN C / 7720 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24164EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24164EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24164emk30d1",
      "＊24164emk30d1",
      "24164EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22264EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22264EMD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3950,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 261,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 177000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "22264EMD1 belongs to the 22200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 22264EMD1 to its envelope and execution: same-number EA versus EM or plain variants share the 320 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 261 kN against C0 5100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 22264EMD1 moves with cleanliness far more than with small C variations. Never mount 22264EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 580 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 320 mm bore 22264EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 22264EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 800 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 22264EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 3950/5100 kN ratings, 261 kN Pu and 177000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22264EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22264EMD1?",
        "a": "22264EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3950 kN, C0 5100 kN, Pu 261 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 177000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "22264EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 22264EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22264EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22264EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22264EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22264EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3950 kN C / 5100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22264EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 22264EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22264emd1",
      "＊22264emd1",
      "22264EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "22264EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 22264EMKD1",
    "series": "22200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3950,
    "static_load_kN": 5100,
    "fatigue_load_limit_kN": 261,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 174000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 320 mm shaft, NTN supplies 22264EMKD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,020 r/min. Reading the full code: the number gives the 320×580 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 320 mm bore is 12.598 in and 580 mm OD is 22.835 in; the ISO 15 envelope swaps between brands, but the 3950/5100 kN ratings and cage design are NTN 2203E values. Mount 22264EMKD1 on its adapter or withdrawal sleeve on the 320 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 320 mm bore 22264EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3950 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 22264EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 22264EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "The 3950/5100 kN ratings, 261 kN Pu and 174000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 22264EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 22264EMKD1?",
        "a": "22264EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 150 mm width (12.598 × 22.835 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3950 kN, C0 5100 kN, Pu 261 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 174000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 22264EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 22264EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 22264EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 22264EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 22264EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 22264EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 22200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3950 kN C / 5100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "22264EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 22200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 22264EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "22264emkd1",
      "＊22264emkd1",
      "22264EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23264EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23264EMD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 208,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5230,
    "static_load_kN": 7370,
    "fatigue_load_limit_kN": 259,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 245000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23264EMD1 denotes the 320 mm bore spherical roller bearing (5230 kN C / 7370 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 320 mm bore; the 208 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 5230 kN, C0 7370 kN (C0/C ≈ 1.41), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 640 r/min grease limiting speed is the cage/kinematic ceiling and 820 r/min is the oil-lubricated value for the 320 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23264EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 320 mm bore 23264EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23264EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 320 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23264EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 320 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5230/7370 kN ratings, 259 kN Pu and 245000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23264EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23264EMD1?",
        "a": "23264EMD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 208 mm width (12.598 × 22.835 × 8.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5230 kN, C0 7370 kN, Pu 259 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 245000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23264EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23264EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23264EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23264EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23264EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23264EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5230 kN C / 7370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23264EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23264EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23264emd1",
      "＊23264emd1",
      "23264EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23264EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23264EMKD1",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 320,
    "D_mm": 580,
    "B_mm": 208,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5230,
    "static_load_kN": 7370,
    "fatigue_load_limit_kN": 259,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 238000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23264EMKD1 belongs to the 23200 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 320 mm (two-digit code ×5, with the 00–03 exception table), and 580 mm OD / 208 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 320 mm bore is 12.598 in and 580 mm OD is 22.835 in; the ISO 15 envelope swaps between brands, but the 5230/7370 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 208 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 320 mm bore 23264EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23264EMKD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23264EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23264EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 320×580 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23264EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5230/7370 kN ratings, 259 kN Pu and 238000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23264EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23264EMKD1?",
        "a": "23264EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 320 mm bore, 580 mm OD and 208 mm width (12.598 × 22.835 × 8.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5230 kN, C0 7370 kN, Pu 259 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 238000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23264EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23264EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23264EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23264EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23264EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23264EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5230 kN C / 7370 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23264EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23264EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23264emkd1",
      "＊23264emkd1",
      "23264EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23968EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23968EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 162,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 44500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 340 mm shaft, NTN supplies 23968EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 1,020 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 340 mm (two-digit code ×5, with the 00–03 exception table), and 460 mm OD / 90 mm width follow the general plan. The cylindrical bore fits a machined 340 mm shaft seat directly; the same envelope in 23968EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 162 kN against C0 2980 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23968EMD1 moves with cleanliness far more than with small C variations. Never mount 23968EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 460 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 340 mm bore 23968EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 1710 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23968EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×460 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 23968EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×460 mm envelope is identical.",
      "The 1710/2980 kN ratings, 162 kN Pu and 44500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23968EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23968EMD1?",
        "a": "23968EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 460 mm OD and 90 mm width (13.386 × 18.11 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2980 kN, Pu 162 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 44500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23968EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23968EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23968EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23968EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23968EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23968EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1710 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23968EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23968EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23968emd1",
      "＊23968emd1",
      "23968EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23968EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23968EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 460,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1710,
    "static_load_kN": 2980,
    "fatigue_load_limit_kN": 162,
    "limiting_speed_rpm": 800,
    "max_rpm": 800,
    "speed_oil_rpm": 1020,
    "weight_g": 43100,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23968EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 340 mm bore, 460 mm OD, 90 mm width, rated 800 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 90 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 60.0 mm radial section over the 340 mm bore carries two roller rows; capacity per millimetre of bore is about 5.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 162 kN against C0 2980 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23968EMKD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 340 mm bore 23968EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23968EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 340 mm bearing, and drive-up procedures differ.",
      "Never substitute 23968EMKD1 by envelope alone: the 2980 kN C0 and 162 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23968EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1710/2980 kN ratings, 162 kN Pu and 43100 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23968EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23968EMKD1?",
        "a": "23968EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 460 mm OD and 90 mm width (13.386 × 18.11 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1710 kN, C0 2980 kN, Pu 162 kN, grease limiting speed 800 r/min, oil 1,020 r/min, mass about 43100 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23968EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23968EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23968EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23968EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23968EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23968EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1710 kN C / 2980 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23968EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23968EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23968emkd1",
      "＊23968emkd1",
      "23968EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23068EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23068EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2990,
    "static_load_kN": 4690,
    "fatigue_load_limit_kN": 219,
    "limiting_speed_rpm": 790,
    "max_rpm": 790,
    "speed_oil_rpm": 1000,
    "weight_g": 98500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23068EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 340 mm shaft — 2990 kN basic dynamic capacity in a 98500 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 133 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23068EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Catalogue mass 98500 g (98.50 kg) for the 340×520×133 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 340 mm bore 23068EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23068EMD1 and its tapered-bore counterpart 23068EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 133 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23068EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2990 kN rating no longer applies.",
      "The 2990/4690 kN ratings, 219 kN Pu and 98500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23068EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23068EMD1?",
        "a": "23068EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2990 kN, C0 4690 kN, Pu 219 kN, grease limiting speed 790 r/min, oil 1,000 r/min, mass about 98500 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23068EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23068EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23068EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23068EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23068EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23068EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2990 kN C / 4690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23068EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23068EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23068emd1",
      "＊23068emd1",
      "23068EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23068EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23068EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 133,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2990,
    "static_load_kN": 4690,
    "fatigue_load_limit_kN": 219,
    "limiting_speed_rpm": 790,
    "max_rpm": 790,
    "speed_oil_rpm": 1000,
    "weight_g": 95500,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23068EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 340×520×133 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Reading the full code: the number gives the 340×520 mm envelope, EM names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and D1 outer-ring annular oil groove with holes completes the order number. Open by design, 23068EMKD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 340 mm bore is 13.386 in and 520 mm OD is 20.472 in; the ISO 15 envelope swaps between brands, but the 2990/4690 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 133 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 340 mm bore 23068EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 133 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Oil relubrication toward 1,000 r/min needs drain and level design; flooding the 133 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2990 kN rating no longer applies.",
      "The 2990/4690 kN ratings, 219 kN Pu and 95500 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23068EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23068EMKD1?",
        "a": "23068EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 133 mm width (13.386 × 20.472 × 5.236 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2990 kN, C0 4690 kN, Pu 219 kN, grease limiting speed 790 r/min, oil 1,000 r/min, mass about 95500 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23068EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23068EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23068EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23068EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23068EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23068EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2990 kN C / 4690 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23068EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23068EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23068emkd1",
      "＊23068emkd1",
      "23068EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24068EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24068EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3910,
    "static_load_kN": 6510,
    "fatigue_load_limit_kN": 206,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 140000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24068EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 340 mm shaft — 3910 kN basic dynamic capacity in a 140000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24068EMD1 is assembled exactly in that order. Suffix reading on 24068EMD1: EM identifies the high-capacity execution with a one-piece machined brass cage; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 206 kN against C0 6510 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24068EMD1 moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 340 mm bore 24068EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 670 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 340 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24068EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3910/6510 kN ratings, 206 kN Pu and 140000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24068EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24068EMD1?",
        "a": "24068EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 180 mm width (13.386 × 20.472 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3910 kN, C0 6510 kN, Pu 206 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 140000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24068EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24068EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24068EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24068EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24068EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24068EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3910 kN C / 6510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24068EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24068EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24068emd1",
      "＊24068emd1",
      "24068EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24068EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24068EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 520,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3910,
    "static_load_kN": 6510,
    "fatigue_load_limit_kN": 206,
    "limiting_speed_rpm": 670,
    "max_rpm": 670,
    "speed_oil_rpm": 860,
    "weight_g": 137000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24068EMK30D1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 340×520×180 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). Numbering ties 24068EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 340 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 206 kN against C0 6510 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24068EMK30D1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 340 mm bore 24068EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3910 kN rating no longer applies.",
      "Never substitute 24068EMK30D1 by envelope alone: the 6510 kN C0 and 206 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 24068EMK30D1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 340 mm bearing, and drive-up procedures differ.",
      "The 3910/6510 kN ratings, 206 kN Pu and 137000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24068EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24068EMK30D1?",
        "a": "24068EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 520 mm OD and 180 mm width (13.386 × 20.472 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3910 kN, C0 6510 kN, Pu 206 kN, grease limiting speed 670 r/min, oil 860 r/min, mass about 137000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24068EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 340 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24068EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24068EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24068EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24068EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24068EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3910 kN C / 6510 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24068EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24068EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24068emk30d1",
      "＊24068emk30d1",
      "24068EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23168EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23168EMD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4670,
    "static_load_kN": 6870,
    "fatigue_load_limit_kN": 257,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 213000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23168EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 340 mm bore, 580 mm OD, 190 mm width, rated 650 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 23168EMD1 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 340 mm bore is 13.386 in and 580 mm OD is 22.835 in; the ISO 15 envelope swaps between brands, but the 4670/6870 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 340 mm bore 23168EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23168EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23168EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4670/6870 kN ratings, 257 kN Pu and 213000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23168EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23168EMD1?",
        "a": "23168EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 190 mm width (13.386 × 22.835 × 7.48 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4670 kN, C0 6870 kN, Pu 257 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 213000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23168EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23168EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23168EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23168EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23168EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23168EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4670 kN C / 6870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23168EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23168EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23168emd1",
      "＊23168emd1",
      "23168EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23168EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23168EMKD1",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 190,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4670,
    "static_load_kN": 6870,
    "fatigue_load_limit_kN": 257,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 206000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23168EMKD1 with a 1:12 tapered bore (K) and D1 outer-ring annular oil groove with holes: 340 mm bore, 580 mm OD, 190 mm width, rated 650 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23168EMKD1 is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 206000 g (206.00 kg) for the 340×580×190 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 340 mm bore 23168EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23168EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 23168EMKD1 by envelope alone: the 6870 kN C0 and 257 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23168EMKD1 by envelope alone: the 6870 kN C0 and 257 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 4670/6870 kN ratings, 257 kN Pu and 206000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23168EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23168EMKD1?",
        "a": "23168EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 190 mm width (13.386 × 22.835 × 7.48 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4670 kN, C0 6870 kN, Pu 257 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 206000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23168EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23168EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23168EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23168EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23168EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23168EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4670 kN C / 6870 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23168EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23168EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23168emkd1",
      "＊23168emkd1",
      "23168EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24168EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24168EMD1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5980,
    "static_load_kN": 9340,
    "fatigue_load_limit_kN": 254,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 266000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 340 mm shaft, NTN supplies 24168EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 830 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 340 mm (two-digit code ×5, with the 00–03 exception table), and 580 mm OD / 243 mm width follow the general plan. Open by design, 24168EMD1 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 17.6 kN of C per millimetre of the 340 mm bore, 24168EMD1 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 340 mm bore 24168EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24168EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×580 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5980 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5980 kN rating no longer applies.",
      "The 5980/9340 kN ratings, 254 kN Pu and 266000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24168EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24168EMD1?",
        "a": "24168EMD1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 243 mm width (13.386 × 22.835 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5980 kN, C0 9340 kN, Pu 254 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 266000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24168EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24168EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24168EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24168EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24168EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24168EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5980 kN C / 9340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24168EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24168EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24168emd1",
      "＊24168emd1",
      "24168EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24168EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24168EMK30D1",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 580,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 5980,
    "static_load_kN": 9340,
    "fatigue_load_limit_kN": 254,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 262000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24168EMK30D1 belongs to the 24100 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 243 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. At 5980 kN C and 262000 g mass the 24100 series part is built for shock and vibration; the 243 mm-wide ring needs square abutments to keep both rows equally loaded. The 120.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 243 mm-wide ring seats fully on both sides. Never mount 24168EMK30D1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 580 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 340 mm bore 24168EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24168EMK30D1 by envelope alone: the 9340 kN C0 and 254 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 830 r/min needs drain and level design; flooding the 243 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 24168EMK30D1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×580 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 5980/9340 kN ratings, 254 kN Pu and 262000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24168EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24168EMK30D1?",
        "a": "24168EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 580 mm OD and 243 mm width (13.386 × 22.835 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5980 kN, C0 9340 kN, Pu 254 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 262000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24168EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 340 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24168EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24168EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24168EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24168EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24168EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5980 kN C / 9340 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24168EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24168EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24168emk30d1",
      "＊24168emk30d1",
      "24168EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23268B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23268B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 300000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23268B denotes the 340 mm bore spherical roller bearing (4950 kN C / 8000 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Numbering ties 23268B to its envelope and execution: same-number EA versus EM or plain variants share the 340 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Selection: the C0/C ratio of 1.62 (8000/4950 kN) reflects the heavy static and shock proportioning of 23268B; size the equivalent load at the required L10 with shock factor for the application. Never mount 23268B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 340 mm bore 23268B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 224 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23268B by envelope alone: the 8000 kN C0 and 585 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 340 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23268B by envelope alone: the 8000 kN C0 and 585 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 4950/8000 kN ratings, 585 kN Pu and 300000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23268B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23268B?",
        "a": "23268B is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 620 mm OD and 224 mm width (13.386 × 24.409 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 8000 kN, Pu 585 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 300000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23268B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23268BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23268B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23268B?",
        "a": "23268B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23268B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23268BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23268BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23268b",
      "23268B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23268BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23268BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 340,
    "D_mm": 620,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 291000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23268BK belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 340 mm bore; the 224 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 340 mm bore assembly. 340 mm bore is 13.386 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 4950/8000 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 340 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 340 mm bore 23268BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23268B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 630 r/min needs drain and level design; flooding the 224 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Do not confuse EA and EM at the same number: 23268BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 340×620 mm envelope is identical.",
      "The 4950/8000 kN ratings, 585 kN Pu and 291000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23268BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23268BK?",
        "a": "23268BK is an NTN double-row spherical roller bearing to ISO 15: 340 mm bore, 620 mm OD and 224 mm width (13.386 × 24.409 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 8000 kN, Pu 585 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 291000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23268BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23268B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23268BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23268BK?",
        "a": "23268BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23268BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23268B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23268B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23268bk",
      "23268BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23972EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23972EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1750,
    "static_load_kN": 3090,
    "fatigue_load_limit_kN": 171,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 46200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23972EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 360 mm bore, 480 mm OD, 90 mm width, rated 760 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 480 mm OD / 90 mm width follow the general plan. Pu 171 kN is the catalogue fatigue load limit for 23972EMD1, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 360 mm bore is 14.173 in and 480 mm OD is 18.898 in; the ISO 15 envelope swaps between brands, but the 1750/3090 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 360 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 23972EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23972EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23972EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a D1 23972EMD1 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1750/3090 kN ratings, 171 kN Pu and 46200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23972EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23972EMD1?",
        "a": "23972EMD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 480 mm OD and 90 mm width (14.173 × 18.898 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 3090 kN, Pu 171 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 46200 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23972EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23972EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23972EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23972EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23972EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23972EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1750 kN C / 3090 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23972EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23972EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23972emd1",
      "＊23972emd1",
      "23972EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23972EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23972EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 480,
    "B_mm": 90,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 1750,
    "static_load_kN": 3090,
    "fatigue_load_limit_kN": 171,
    "limiting_speed_rpm": 760,
    "max_rpm": 760,
    "speed_oil_rpm": 970,
    "weight_g": 44800,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23972EMKD1 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 360×480×90 mm to ISO 15, with one-piece machined brass cage (EM high-capacity design). On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23972EMKD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23972EMKD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 23972EMKD1 on its adapter or withdrawal sleeve on the 360 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 23972EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 90 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 760 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23972EMKD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×480 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 360 mm bearing, and drive-up procedures differ.",
      "The 1750/3090 kN ratings, 171 kN Pu and 44800 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23972EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23972EMKD1?",
        "a": "23972EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 480 mm OD and 90 mm width (14.173 × 18.898 × 3.543 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 1750 kN, C0 3090 kN, Pu 171 kN, grease limiting speed 760 r/min, oil 970 r/min, mass about 44800 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23972EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23972EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23972EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23972EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23972EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23972EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 1750 kN C / 3090 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23972EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23972EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23972emkd1",
      "＊23972emkd1",
      "23972EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23072EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23072EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3070,
    "static_load_kN": 4910,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 111000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23072EMD1 denotes the 360 mm bore spherical roller bearing (3070 kN C / 4910 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 360×540 mm envelope, EM names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and D1 outer-ring annular oil groove with holes completes the order number. The cylindrical bore fits a machined 360 mm shaft seat directly; the same envelope in 23072EMKD1 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 23072EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 360 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 360 mm bore 23072EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3070 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23072EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×540 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 23072EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×540 mm envelope is identical.",
      "The 3070/4910 kN ratings, 232 kN Pu and 111000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23072EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23072EMD1?",
        "a": "23072EMD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3070 kN, C0 4910 kN, Pu 232 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 111000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23072EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23072EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23072EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23072EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23072EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23072EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3070 kN C / 4910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23072EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23072EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23072emd1",
      "＊23072emd1",
      "23072EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23072EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23072EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 134,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3070,
    "static_load_kN": 4910,
    "fatigue_load_limit_kN": 232,
    "limiting_speed_rpm": 750,
    "max_rpm": 750,
    "speed_oil_rpm": 950,
    "weight_g": 108000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23072EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 360 mm shaft — 3070 kN basic dynamic capacity in a 108000 g, open ISO 15 envelope. Numbering ties 23072EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 360 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23072EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. Pu 232 kN against C0 4910 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23072EMKD1 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 360 mm bore 23072EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 750 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23072EMKD1 by envelope alone: the 4910 kN C0 and 232 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 134 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 3070/4910 kN ratings, 232 kN Pu and 108000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23072EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23072EMKD1?",
        "a": "23072EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 134 mm width (14.173 × 21.26 × 5.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3070 kN, C0 4910 kN, Pu 232 kN, grease limiting speed 750 r/min, oil 950 r/min, mass about 108000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23072EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23072EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23072EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23072EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23072EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23072EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3070 kN C / 4910 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23072EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23072EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23072emkd1",
      "＊23072emkd1",
      "23072EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24072EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24072EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4040,
    "static_load_kN": 6840,
    "fatigue_load_limit_kN": 220,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 147000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24072EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 360 mm shaft — 4040 kN basic dynamic capacity in a 147000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24072EMD1 is assembled exactly in that order. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 360 mm bore is 14.173 in and 540 mm OD is 21.26 in; the ISO 15 envelope swaps between brands, but the 4040/6840 kN ratings and cage design are NTN 2203E values. Never mount 24072EMD1 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 540 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 360 mm bore 24072EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24072EMD1 by envelope alone: the 6840 kN C0 and 220 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24072EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24072EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 360 mm bearing, and drive-up procedures differ.",
      "The 4040/6840 kN ratings, 220 kN Pu and 147000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24072EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24072EMD1?",
        "a": "24072EMD1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 180 mm width (14.173 × 21.26 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4040 kN, C0 6840 kN, Pu 220 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 147000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24072EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24072EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24072EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24072EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24072EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24072EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4040 kN C / 6840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24072EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24072EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24072emd1",
      "＊24072emd1",
      "24072EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24072EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24072EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 540,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4040,
    "static_load_kN": 6840,
    "fatigue_load_limit_kN": 220,
    "limiting_speed_rpm": 640,
    "max_rpm": 640,
    "speed_oil_rpm": 820,
    "weight_g": 145000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24072EMK30D1 belongs to the 24000 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K30), lubrication feature (D1); 24072EMK30D1 is assembled exactly in that order. NTN prints two speeds for 24072EMK30D1: 640 r/min grease and 820 r/min oil — the gap of 180 r/min reflects oil cooling of the heavy roller set. Pu 220 kN against C0 6840 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24072EMK30D1 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 180 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 360 mm bore 24072EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4040 kN rating no longer applies.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24072EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 820 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4040/6840 kN ratings, 220 kN Pu and 145000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24072EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24072EMK30D1?",
        "a": "24072EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 540 mm OD and 180 mm width (14.173 × 21.26 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4040 kN, C0 6840 kN, Pu 220 kN, grease limiting speed 640 r/min, oil 820 r/min, mass about 145000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24072EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 360 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24072EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24072EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24072EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24072EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24072EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4040 kN C / 6840 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24072EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24072EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24072emk30d1",
      "＊24072emk30d1",
      "24072EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23172B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23172B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4200,
    "static_load_kN": 7050,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 222000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23172B denotes the 360 mm bore spherical roller bearing (4200 kN C / 7050 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 600 mm OD / 192 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Catalogue mass 222000 g (222.00 kg) for the 360×600×192 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 192 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 360 mm bore 23172B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 192 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 192 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23172B by envelope alone: the 7050 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 4200/7050 kN ratings, 530 kN Pu and 222000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23172B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23172B?",
        "a": "23172B is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 192 mm width (14.173 × 23.622 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4200 kN, C0 7050 kN, Pu 530 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 222000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23172B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23172BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23172B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23172B?",
        "a": "23172B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23172B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4200 kN C / 7050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23172BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23172BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23172b",
      "23172B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23172BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23172BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 192,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4200,
    "static_load_kN": 7050,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 215000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23172BK identifies a 360×600×192 mm (14.173 × 23.622 × 7.559 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Numbering ties 23172BK to its envelope and execution: same-number EA versus EM or plain variants share the 360 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23172BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.68 (7050/4200 kN) reflects the heavy static and shock proportioning of 23172BK; size the equivalent load at the required L10 with shock factor for the application. Never mount 23172BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 600 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 23172BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23172BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×600 mm envelope is identical.",
      "Never substitute 23172BK by envelope alone: the 7050 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 360 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 192 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4200/7050 kN ratings, 530 kN Pu and 215000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23172BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23172BK?",
        "a": "23172BK is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 192 mm width (14.173 × 23.622 × 7.559 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4200 kN, C0 7050 kN, Pu 530 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 215000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23172BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23172B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23172BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23172BK?",
        "a": "23172BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23172BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4200 kN C / 7050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23172B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23172B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23172bk",
      "23172BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24172B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24172B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 281000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24172B with a cylindrical bore and plain outer ring (no D1/W33 groove): 360 mm bore, 600 mm OD, 243 mm width, rated 490 r/min on grease. Reading the full code: the number gives the 360×600 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The cylindrical bore fits a machined 360 mm shaft seat directly; the same envelope in 24172BK30 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. With about 14.2 kN of C per millimetre of the 360 mm bore, 24172B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 243 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 360 mm bore 24172B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5100 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24172B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 360×600 mm envelope is identical.",
      "The 5100/9150 kN ratings, 470 kN Pu and 281000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24172B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24172B?",
        "a": "24172B is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 243 mm width (14.173 × 23.622 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 9150 kN, Pu 470 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 281000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24172B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24172BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24172B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24172B?",
        "a": "24172B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24172B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 9150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24172BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24172BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24172b",
      "24172B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24172BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24172BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 600,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 9150,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 630,
    "weight_g": 277000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24172BK30 denotes the 360 mm bore spherical roller bearing (5100 kN C / 9150 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 600 mm OD / 243 mm width follow the general plan. Suffix reading on 24172BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 24172BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 360 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 360 mm bore 24172BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 360 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24172BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 243 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 243 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 5100/9150 kN ratings, 470 kN Pu and 277000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24172BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24172BK30?",
        "a": "24172BK30 is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 600 mm OD and 243 mm width (14.173 × 23.622 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 9150 kN, Pu 470 kN, grease limiting speed 490 r/min, oil 630 r/min, mass about 277000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24172BK30 mounts on a matching adapter or withdrawal sleeve on a plain 360 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24172B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24172BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24172BK30?",
        "a": "24172BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24172BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 9150 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24172B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24172B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24172bk30",
      "24172BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23272B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23272B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 650,
    "B_mm": 232,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5400,
    "static_load_kN": 8700,
    "fatigue_load_limit_kN": 620,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 339000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23272B belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23272B to its envelope and execution: same-number EA versus EM or plain variants share the 360 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 360 mm bore is 14.173 in and 650 mm OD is 25.591 in; the ISO 15 envelope swaps between brands, but the 5400/8700 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 360 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 360 mm bore 23272B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23272B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 590 r/min needs drain and level design; flooding the 232 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23272B by envelope alone: the 8700 kN C0 and 620 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23272B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5400/8700 kN ratings, 620 kN Pu and 339000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23272B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23272B?",
        "a": "23272B is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 650 mm OD and 232 mm width (14.173 × 25.591 × 9.134 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5400 kN, C0 8700 kN, Pu 620 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 339000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23272B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23272BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23272B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23272B?",
        "a": "23272B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23272B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5400 kN C / 8700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23272BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23272BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23272b",
      "23272B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23272BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23272BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 360,
    "D_mm": 650,
    "B_mm": 232,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5400,
    "static_load_kN": 8700,
    "fatigue_load_limit_kN": 620,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 329000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23272BK belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 360 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 232 mm width follow the general plan. Pu 620 kN is the catalogue fatigue load limit for 23272BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 145.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 232 mm-wide ring seats fully on both sides. Never mount 23272BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 650 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 360 mm bore 23272BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23272BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 590 r/min needs drain and level design; flooding the 232 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23272BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5400/8700 kN ratings, 620 kN Pu and 329000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23272BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23272BK?",
        "a": "23272BK is an NTN double-row spherical roller bearing to ISO 15: 360 mm bore, 650 mm OD and 232 mm width (14.173 × 25.591 × 9.134 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5400 kN, C0 8700 kN, Pu 620 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 329000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23272BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23272B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23272BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23272BK?",
        "a": "23272BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23272BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5400 kN C / 8700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23272B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23272B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=213",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23272bk",
      "23272BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23976EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23976EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 710,
    "max_rpm": 710,
    "speed_oil_rpm": 910,
    "weight_g": 68000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 380 mm shaft, NTN supplies 23976EMD1: sphered outer raceway, two roller rows, one-piece machined brass cage (EM high-capacity design), oil speed 910 r/min. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 380 mm (two-digit code ×5, with the 00–03 exception table), and 520 mm OD / 106 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the EM machined-brass-cage cage. Catalogue mass 68000 g (68.00 kg) for the 380×520×106 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 380 mm bore 23976EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 710 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The cylindrical-bore 23976EMD1 and its tapered-bore counterpart 23976EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23976EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23976EMD1 by envelope alone: the 4000 kN C0 and 205 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 2340/4000 kN ratings, 205 kN Pu and 68000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23976EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23976EMD1?",
        "a": "23976EMD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 520 mm OD and 106 mm width (14.961 × 20.472 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4000 kN, Pu 205 kN, grease limiting speed 710 r/min, oil 910 r/min, mass about 68000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23976EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23976EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23976EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23976EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23976EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23976EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23976EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23976EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23976emd1",
      "＊23976emd1",
      "23976EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23976EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23976EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 520,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4000,
    "fatigue_load_limit_kN": 205,
    "limiting_speed_rpm": 710,
    "max_rpm": 710,
    "speed_oil_rpm": 910,
    "weight_g": 65900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23976EMKD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 380 mm shaft — 2340 kN basic dynamic capacity in a 65900 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (K), lubrication feature (D1); 23976EMKD1 is assembled exactly in that order. Suffix reading on 23976EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. 380 mm bore is 14.961 in and 520 mm OD is 20.472 in; the ISO 15 envelope swaps between brands, but the 2340/4000 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 380 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 380 mm bore 23976EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 910 r/min needs drain and level design; flooding the 106 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23976EMKD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2340/4000 kN ratings, 205 kN Pu and 65900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23976EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23976EMKD1?",
        "a": "23976EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 520 mm OD and 106 mm width (14.961 × 20.472 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4000 kN, Pu 205 kN, grease limiting speed 710 r/min, oil 910 r/min, mass about 65900 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23976EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23976EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23976EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23976EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23976EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23976EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23976EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23976EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23976emkd1",
      "＊23976emkd1",
      "23976EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23076EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23076EMD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3230,
    "static_load_kN": 5270,
    "fatigue_load_limit_kN": 247,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 910,
    "weight_g": 117000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23076EMD1 denotes the 380 mm bore spherical roller bearing (3230 kN C / 5270 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 380 mm bore; the 135 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 23076EMD1: 720 r/min grease and 910 r/min oil — the gap of 190 r/min reflects oil cooling of the heavy roller set. Catalogue mass 117000 g (117.00 kg) for the 380×560×135 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 380 mm bore 23076EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Never substitute 23076EMD1 by envelope alone: the 5270 kN C0 and 247 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23076EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 910 r/min needs drain and level design; flooding the 135 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 3230/5270 kN ratings, 247 kN Pu and 117000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23076EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23076EMD1?",
        "a": "23076EMD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3230 kN, C0 5270 kN, Pu 247 kN, grease limiting speed 720 r/min, oil 910 r/min, mass about 117000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23076EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23076EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23076EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23076EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23076EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23076EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3230 kN C / 5270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23076EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23076EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23076emd1",
      "＊23076emd1",
      "23076EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23076EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23076EMKD1",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 135,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 3230,
    "static_load_kN": 5270,
    "fatigue_load_limit_kN": 247,
    "limiting_speed_rpm": 720,
    "max_rpm": 720,
    "speed_oil_rpm": 910,
    "weight_g": 113000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23076EMKD1 denotes the 380 mm bore spherical roller bearing (3230 kN C / 5270 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Numbering ties 23076EMKD1 to its envelope and execution: same-number EA versus EM or plain variants share the 380 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 90.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 8.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 90.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 135 mm-wide ring seats fully on both sides. Fillet radii on shaft and housing must clear the ring chamfers of the 135 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 380 mm bore 23076EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23076EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 3230/5270 kN ratings, 247 kN Pu and 113000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23076EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23076EMKD1?",
        "a": "23076EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 135 mm width (14.961 × 22.047 × 5.315 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3230 kN, C0 5270 kN, Pu 247 kN, grease limiting speed 720 r/min, oil 910 r/min, mass about 113000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23076EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23076EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23076EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23076EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23076EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23076EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3230 kN C / 5270 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23076EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23076EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23076emkd1",
      "＊23076emkd1",
      "23076EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24076EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24076EMD1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4140,
    "static_load_kN": 7280,
    "fatigue_load_limit_kN": 240,
    "limiting_speed_rpm": 610,
    "max_rpm": 610,
    "speed_oil_rpm": 780,
    "weight_g": 154000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24076EMD1 is the EM machined-brass-cage execution of NTN's spherical roller range for a 380 mm shaft — 4140 kN basic dynamic capacity in a 154000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (EM), bore (cylindrical), lubrication feature (D1); 24076EMD1 is assembled exactly in that order. The 90.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 10.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 154000 g (154.00 kg) for the 380×560×180 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 24076EMD1 with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 380 mm bore 24076EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24076EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 24076EMD1 carries EM machined-brass-cage; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×560 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 24076EMD1 and its tapered-bore counterpart 24076EMK30D1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 4140/7280 kN ratings, 240 kN Pu and 154000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24076EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24076EMD1?",
        "a": "24076EMD1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 180 mm width (14.961 × 22.047 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4140 kN, C0 7280 kN, Pu 240 kN, grease limiting speed 610 r/min, oil 780 r/min, mass about 154000 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24076EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24076EMK30D1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24076EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24076EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24076EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24076EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4140 kN C / 7280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24076EMK30D1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24076EMK30D1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24076emd1",
      "＊24076emd1",
      "24076EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24076EMK30D1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24076EMK30D1",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 560,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 4140,
    "static_load_kN": 7280,
    "fatigue_load_limit_kN": 240,
    "limiting_speed_rpm": 610,
    "max_rpm": 610,
    "speed_oil_rpm": 780,
    "weight_g": 151000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24076EMK30D1 identifies a 380×560×180 mm (14.961 × 22.047 × 7.087 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Numbering ties 24076EMK30D1 to its envelope and execution: same-number EA versus EM or plain variants share the 380 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 90.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 10.9 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 380 mm bore is 14.961 in and 560 mm OD is 22.047 in; the ISO 15 envelope swaps between brands, but the 4140/7280 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 180 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 380 mm bore 24076EMK30D1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Never substitute 24076EMK30D1 by envelope alone: the 7280 kN C0 and 240 kN Pu are specific to the NTN EM machined-brass-cage execution, and vibrating duty depends heavily on cage identity.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24076EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4140/7280 kN ratings, 240 kN Pu and 151000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24076EMK30D1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24076EMK30D1?",
        "a": "24076EMK30D1 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 560 mm OD and 180 mm width (14.961 × 22.047 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4140 kN, C0 7280 kN, Pu 240 kN, grease limiting speed 610 r/min, oil 780 r/min, mass about 151000 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24076EMK30D1 mounts on a matching adapter or withdrawal sleeve on a plain 380 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24076EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24076EMK30D1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 24076EMK30D1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 24076EMK30D1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 24076EMK30D1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4140 kN C / 7280 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24076EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24076EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24076emk30d1",
      "＊24076emk30d1",
      "24076EMK30D1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23176B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23176B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 194,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4350,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 235000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23176B belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23176B to its envelope and execution: same-number EA versus EM or plain variants share the 380 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 4350 kN C and 235000 g mass the 23100 series part is built for shock and vibration; the 194 mm-wide ring needs square abutments to keep both rows equally loaded. Equivalent-load planning keeps a radial plus moderate axial combination on 23176B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23176B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 380 mm bore 23176B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23176B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 4350/7500 kN ratings, 560 kN Pu and 235000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23176B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23176B?",
        "a": "23176B is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 194 mm width (14.961 × 24.409 × 7.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4350 kN, C0 7500 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 235000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23176B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23176BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23176B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23176B?",
        "a": "23176B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23176B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4350 kN C / 7500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23176BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23176BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23176b",
      "23176B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23176BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23176BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 194,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4350,
    "static_load_kN": 7500,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 228000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23176BK denotes the 380 mm bore spherical roller bearing (4350 kN C / 7500 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 380 mm bore; the 194 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 228000 g (228.00 kg) for the 380×620×194 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 380 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 380 mm bore 23176BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23176BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23176BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23176BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23176BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4350/7500 kN ratings, 560 kN Pu and 228000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23176BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23176BK?",
        "a": "23176BK is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 194 mm width (14.961 × 24.409 × 7.638 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4350 kN, C0 7500 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 228000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23176BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23176B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23176BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23176BK?",
        "a": "23176BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23176BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4350 kN C / 7500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23176B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23176B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23176bk",
      "23176BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24176B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24176B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 292000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24176B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 380×620×243 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 380 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 243 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. 380 mm bore is 14.961 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 5350/9650 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 243 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 380 mm bore 24176B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 24176B and its tapered-bore counterpart 24176BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 24176B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24176B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24176B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5350/9650 kN ratings, 570 kN Pu and 292000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24176B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24176B?",
        "a": "24176B is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 243 mm width (14.961 × 24.409 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 9650 kN, Pu 570 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 292000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24176B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24176BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24176B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24176B?",
        "a": "24176B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24176B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24176BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24176BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24176b",
      "24176B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24176BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24176BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 620,
    "B_mm": 243,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 287000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24176BK30 denotes the 380 mm bore spherical roller bearing (5350 kN C / 9650 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 380 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 243 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. 380 mm bore is 14.961 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 5350/9650 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 380 mm bore 24176BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 24176BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 24176BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×620 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 24176BK30 by envelope alone: the 9650 kN C0 and 570 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 5350/9650 kN ratings, 570 kN Pu and 287000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24176BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24176BK30?",
        "a": "24176BK30 is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 620 mm OD and 243 mm width (14.961 × 24.409 × 9.567 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 9650 kN, Pu 570 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 287000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24176BK30 mounts on a matching adapter or withdrawal sleeve on a plain 380 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24176B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24176BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24176BK30?",
        "a": "24176BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24176BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24176B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24176B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24176bk30",
      "24176BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23276B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23276B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 680,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 550,
    "weight_g": 380000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 380 mm shaft, NTN supplies 23276B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 550 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23276B is assembled exactly in that order. Two symmetric roller rows share the load: C 5800 kN, C0 9650 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.66 (9650/5800 kN) reflects the heavy static and shock proportioning of 23276B; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 240 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 380 mm bore 23276B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 240 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23276B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 380×680 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 380 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5800/9650 kN ratings, 665 kN Pu and 380000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23276B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23276B?",
        "a": "23276B is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 680 mm OD and 240 mm width (14.961 × 26.772 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9650 kN, Pu 665 kN, grease limiting speed 430 r/min, oil 550 r/min, mass about 380000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23276B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23276BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23276B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23276B?",
        "a": "23276B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23276B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23276BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23276BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23276b",
      "23276B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23276BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23276BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 380,
    "D_mm": 680,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9650,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 550,
    "weight_g": 369000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23276BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 380×680×240 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 380×680 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 150.0 mm radial section over the 380 mm bore carries two roller rows; capacity per millimetre of bore is about 15.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 665 kN against C0 9650 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23276BK moves with cleanliness far more than with small C variations. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 380 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 380 mm bore 23276BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23276BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 380 mm bearing, and drive-up procedures differ.",
      "Never substitute 23276BK by envelope alone: the 9650 kN C0 and 665 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23276B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 5800/9650 kN ratings, 665 kN Pu and 369000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23276BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23276BK?",
        "a": "23276BK is an NTN double-row spherical roller bearing to ISO 15: 380 mm bore, 680 mm OD and 240 mm width (14.961 × 26.772 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9650 kN, Pu 665 kN, grease limiting speed 430 r/min, oil 550 r/min, mass about 369000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23276BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23276B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23276BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23276BK?",
        "a": "23276BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23276BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9650 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23276B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23276B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23276bk",
      "23276BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23980EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23980EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2370,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 215,
    "limiting_speed_rpm": 680,
    "max_rpm": 680,
    "speed_oil_rpm": 870,
    "weight_g": 71400,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23980EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 400 mm bore, 540 mm OD, 106 mm width, rated 680 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 400 mm bore; the 106 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The D1 outer-ring annular oil groove with holes makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23980EMD1; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 400 mm bore 23980EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 870 r/min needs drain and level design; flooding the 106 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The 2370/4170 kN ratings, 215 kN Pu and 71400 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23980EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23980EMD1?",
        "a": "23980EMD1 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 540 mm OD and 106 mm width (15.748 × 21.26 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2370 kN, C0 4170 kN, Pu 215 kN, grease limiting speed 680 r/min, oil 870 r/min, mass about 71400 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23980EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23980EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23980EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23980EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23980EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23980EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2370 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23980EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23980EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23980emd1",
      "＊23980emd1",
      "23980EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23980EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23980EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 540,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2370,
    "static_load_kN": 4170,
    "fatigue_load_limit_kN": 215,
    "limiting_speed_rpm": 680,
    "max_rpm": 680,
    "speed_oil_rpm": 870,
    "weight_g": 69200,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23980EMKD1 denotes the 400 mm bore spherical roller bearing (2370 kN C / 4170 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 540 mm OD / 106 mm width follow the general plan. Two symmetric roller rows share the load: C 2370 kN, C0 4170 kN (C0/C ≈ 1.76), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 680 r/min grease limiting speed is the cage/kinematic ceiling and 870 r/min is the oil-lubricated value for the 400 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Mount 23980EMKD1 on its adapter or withdrawal sleeve on the 400 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 400 mm bore 23980EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 680 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 680 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2370 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 2370/4170 kN ratings, 215 kN Pu and 69200 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23980EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23980EMKD1?",
        "a": "23980EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 540 mm OD and 106 mm width (15.748 × 21.26 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2370 kN, C0 4170 kN, Pu 215 kN, grease limiting speed 680 r/min, oil 870 r/min, mass about 69200 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23980EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23980EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23980EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23980EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23980EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23980EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2370 kN C / 4170 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23980EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23980EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23980emkd1",
      "＊23980emkd1",
      "23980EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23080B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23080B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3300,
    "static_load_kN": 6050,
    "fatigue_load_limit_kN": 450,
    "limiting_speed_rpm": 520,
    "max_rpm": 520,
    "speed_oil_rpm": 680,
    "weight_g": 149000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23080B belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 400 mm bore; the 148 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 400 mm shaft seat directly; the same envelope in 23080BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 450 kN against C0 6050 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23080B moves with cleanliness far more than with small C variations. Fit the cylindrical-bore 23080B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 400 mm bore 23080B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23080B and its tapered-bore counterpart 23080BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Oil relubrication toward 680 r/min needs drain and level design; flooding the 148 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23080B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 400×600 mm envelope is identical.",
      "The 3300/6050 kN ratings, 450 kN Pu and 149000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23080B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23080B?",
        "a": "23080B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3300 kN, C0 6050 kN, Pu 450 kN, grease limiting speed 520 r/min, oil 680 r/min, mass about 149000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23080B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23080BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23080B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23080B?",
        "a": "23080B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23080B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3300 kN C / 6050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23080BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23080BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23080b",
      "23080B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23080BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23080BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 148,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3300,
    "static_load_kN": 6050,
    "fatigue_load_limit_kN": 450,
    "limiting_speed_rpm": 520,
    "max_rpm": 520,
    "speed_oil_rpm": 680,
    "weight_g": 144000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23080BK identifies a 400×600×148 mm (15.748 × 23.622 × 5.827 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 23080BK is assembled exactly in that order. NTN prints two speeds for 23080BK: 520 r/min grease and 680 r/min oil — the gap of 160 r/min reflects oil cooling of the heavy roller set. 400 mm bore is 15.748 in and 600 mm OD is 23.622 in; the ISO 15 envelope swaps between brands, but the 3300/6050 kN ratings and cage design are NTN 2203E values. Never mount 23080BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 600 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 400 mm bore 23080BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 680 r/min needs drain and level design; flooding the 148 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23080B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 680 r/min needs drain and level design; flooding the 148 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 3300/6050 kN ratings, 450 kN Pu and 144000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23080BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23080BK?",
        "a": "23080BK is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 148 mm width (15.748 × 23.622 × 5.827 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3300 kN, C0 6050 kN, Pu 450 kN, grease limiting speed 520 r/min, oil 680 r/min, mass about 144000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23080BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23080B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23080BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23080BK?",
        "a": "23080BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23080BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3300 kN C / 6050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23080B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23080B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23080bk",
      "23080BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24080B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24080B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8400,
    "fatigue_load_limit_kN": 485,
    "limiting_speed_rpm": 460,
    "max_rpm": 460,
    "speed_oil_rpm": 600,
    "weight_g": 202000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24080B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 400×600×200 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 400×600 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 460 r/min grease limiting speed is the cage/kinematic ceiling and 600 r/min is the oil-lubricated value for the 400 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fit the cylindrical-bore 24080B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 400 mm bore 24080B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24080B by envelope alone: the 8400 kN C0 and 485 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 600 r/min needs drain and level design; flooding the 200 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24080B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4250/8400 kN ratings, 485 kN Pu and 202000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24080B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24080B?",
        "a": "24080B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 200 mm width (15.748 × 23.622 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8400 kN, Pu 485 kN, grease limiting speed 460 r/min, oil 600 r/min, mass about 202000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24080B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24080BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24080B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24080B?",
        "a": "24080B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24080B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24080BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24080BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24080b",
      "24080B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24080BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24080BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 600,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8400,
    "fatigue_load_limit_kN": 485,
    "limiting_speed_rpm": 460,
    "max_rpm": 460,
    "speed_oil_rpm": 600,
    "weight_g": 200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24080BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 400×600×200 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24080BK30 is assembled exactly in that order. Two symmetric roller rows share the load: C 4250 kN, C0 8400 kN (C0/C ≈ 1.98), with useful axial capacity in either direction alongside the dominant radial load. 400 mm bore is 15.748 in and 600 mm OD is 23.622 in; the ISO 15 envelope swaps between brands, but the 4250/8400 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 400 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 400 mm bore 24080BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24080BK30 by envelope alone: the 8400 kN C0 and 485 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 24080BK30 by envelope alone: the 8400 kN C0 and 485 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 460 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 4250/8400 kN ratings, 485 kN Pu and 200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24080BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24080BK30?",
        "a": "24080BK30 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 600 mm OD and 200 mm width (15.748 × 23.622 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8400 kN, Pu 485 kN, grease limiting speed 460 r/min, oil 600 r/min, mass about 200000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24080BK30 mounts on a matching adapter or withdrawal sleeve on a plain 400 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24080B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24080BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24080BK30?",
        "a": "24080BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24080BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24080B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24080B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24080bk30",
      "24080BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23180B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23180B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4650,
    "static_load_kN": 8050,
    "fatigue_load_limit_kN": 630,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 264000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 400 mm shaft, NTN supplies 23180B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 560 r/min. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 200 mm width follow the general plan. Open by design, 23180B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 11.6 kN of C per millimetre of the 400 mm bore, 23180B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 400 mm bore 23180B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23180B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 400×650 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23180B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The cylindrical-bore 23180B and its tapered-bore counterpart 23180BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4650 kN rating no longer applies.",
      "The 4650/8050 kN ratings, 630 kN Pu and 264000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23180B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23180B?",
        "a": "23180B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 200 mm width (15.748 × 25.591 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4650 kN, C0 8050 kN, Pu 630 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 264000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23180B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23180BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23180B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23180B?",
        "a": "23180B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23180B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4650 kN C / 8050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23180BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23180BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23180b",
      "23180B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23180BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23180BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4650,
    "static_load_kN": 8050,
    "fatigue_load_limit_kN": 630,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 256000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23180BK belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 23180BK to its envelope and execution: same-number EA versus EM or plain variants share the 400 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 4650 kN C and 256000 g mass the 23100 series part is built for shock and vibration; the 200 mm-wide ring needs square abutments to keep both rows equally loaded. With about 11.6 kN of C per millimetre of the 400 mm bore, 23180BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 23180BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 650 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 400 mm bore 23180BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4650 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 23180BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 400×650 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23180BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 4650/8050 kN ratings, 630 kN Pu and 256000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23180BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23180BK?",
        "a": "23180BK is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 200 mm width (15.748 × 25.591 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4650 kN, C0 8050 kN, Pu 630 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 256000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23180BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23180B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23180BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23180BK?",
        "a": "23180BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23180BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4650 kN C / 8050 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23180B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23180B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23180bk",
      "23180BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24180B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24180B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5650,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 329000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24180B identifies a 400×650×250 mm (15.748 × 25.591 × 9.843 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 400 mm bore; the 250 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 125.0 mm radial section over the 400 mm bore carries two roller rows; capacity per millimetre of bore is about 14.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 329000 g (329.00 kg) for the 400×650×250 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 400 mm bore 24180B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24180B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 24180B and its tapered-bore counterpart 24180BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 5650/10300 kN ratings, 585 kN Pu and 329000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24180B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24180B?",
        "a": "24180B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 250 mm width (15.748 × 25.591 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5650 kN, C0 10300 kN, Pu 585 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 329000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24180B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24180BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24180B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24180B?",
        "a": "24180B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24180B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5650 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24180BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24180BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24180b",
      "24180B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24180BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24180BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 650,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5650,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 585,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 324000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24180BK30 belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 250 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 24180BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 400 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 400 mm bore 24180BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24180B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24180BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 250 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The 5650/10300 kN ratings, 585 kN Pu and 324000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24180BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24180BK30?",
        "a": "24180BK30 is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 650 mm OD and 250 mm width (15.748 × 25.591 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5650 kN, C0 10300 kN, Pu 585 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 324000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24180BK30 mounts on a matching adapter or withdrawal sleeve on a plain 400 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24180B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24180BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24180BK30?",
        "a": "24180BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24180BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5650 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24180B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24180B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24180bk30",
      "24180BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23280B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23280B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 720,
    "B_mm": 256,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6500,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 740,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 457000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23280B with a cylindrical bore and plain outer ring (no D1/W33 groove): 400 mm bore, 720 mm OD, 256 mm width, rated 400 r/min on grease. Numbering ties 23280B to its envelope and execution: same-number EA versus EM or plain variants share the 400 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23280B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 400 r/min limiting value is .77 of the 520 r/min oil value; heavy 256 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23280B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 400 mm bore 23280B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 256 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 256 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 6500/10600 kN ratings, 740 kN Pu and 457000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23280B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23280B?",
        "a": "23280B is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 720 mm OD and 256 mm width (15.748 × 28.346 × 10.079 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6500 kN, C0 10600 kN, Pu 740 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 457000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23280B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23280BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23280B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23280B?",
        "a": "23280B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23280B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6500 kN C / 10600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23280BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23280BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23280b",
      "23280B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23280BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23280BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 400,
    "D_mm": 720,
    "B_mm": 256,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6500,
    "static_load_kN": 10600,
    "fatigue_load_limit_kN": 740,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 443000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23280BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 400×720×256 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 400 mm (two-digit code ×5, with the 00–03 exception table), and 720 mm OD / 256 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 443000 g (443.00 kg) for the 400×720×256 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23280BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 400 mm bore 23280BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 400 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6500 kN rating no longer applies.",
      "Never substitute 23280BK by envelope alone: the 10600 kN C0 and 740 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 400 mm bearing, and drive-up procedures differ.",
      "The 6500/10600 kN ratings, 740 kN Pu and 443000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23280BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23280BK?",
        "a": "23280BK is an NTN double-row spherical roller bearing to ISO 15: 400 mm bore, 720 mm OD and 256 mm width (15.748 × 28.346 × 10.079 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6500 kN, C0 10600 kN, Pu 740 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 443000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23280BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23280B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23280BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23280BK?",
        "a": "23280BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23280BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6500 kN C / 10600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23280B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23280B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23280bk",
      "23280BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23984EMD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23984EMD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2390,
    "static_load_kN": 4320,
    "fatigue_load_limit_kN": 230,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 74900,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23984EMD1 with a cylindrical bore and D1 outer-ring annular oil groove with holes: 420 mm bore, 560 mm OD, 106 mm width, rated 650 r/min on grease. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 560 mm OD / 106 mm width follow the general plan. The 70.0 mm radial section over the 420 mm bore carries two roller rows; capacity per millimetre of bore is about 5.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Catalogue mass 74900 g (74.90 kg) for the 420×560×106 mm execution includes the EM machined-brass-cage cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23984EMD1 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 420 mm bore 23984EMD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23984EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23984EMD1 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The cylindrical-bore 23984EMD1 and its tapered-bore counterpart 23984EMKD1 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2390/4320 kN ratings, 230 kN Pu and 74900 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23984EMD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23984EMD1?",
        "a": "23984EMD1 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 560 mm OD and 106 mm width (16.535 × 22.047 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2390 kN, C0 4320 kN, Pu 230 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 74900 g. It is open, with one-piece machined brass cage (EM high-capacity design)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23984EMD1 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23984EMKD1 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23984EMD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23984EMD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23984EMD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23984EMD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2390 kN C / 4320 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23984EMKD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23984EMKD1 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23984emd1",
      "＊23984emd1",
      "23984EMD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23984EMKD1",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23984EMKD1",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 560,
    "B_mm": 106,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "brass_machined_M1",
    "dynamic_load_kN": 2390,
    "static_load_kN": 4320,
    "fatigue_load_limit_kN": 230,
    "limiting_speed_rpm": 650,
    "max_rpm": 650,
    "speed_oil_rpm": 830,
    "weight_g": 72600,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23984EMKD1 belongs to the 23900 series of NTN spherical rollers and carries the ＊ ULTAGE new-generation mark in the 2203E table: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 560 mm OD / 106 mm width follow the general plan. Suffix reading on 23984EMKD1: EM identifies the high-capacity execution with a one-piece machined brass cage; K marks the 1:12 tapered bore; the ＊ symbol in 2203E marks the ULTAGE new-generation specification (not part of the order code); and D1 provides the outer-ring lubrication feature; quote the full code because each suffix is a distinct article. The 70.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 106 mm-wide ring seats fully on both sides. Supply grease through the D1 feature during commissioning and at the calculated interval, rotating the 420 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 420 mm bore 23984EMKD1 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 650 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23984EMD1: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 106 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2390/4320 kN ratings, 230 kN Pu and 72600 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23984EMKD1 (EM machined-brass-cage/D1); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23984EMKD1?",
        "a": "23984EMKD1 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 560 mm OD and 106 mm width (16.535 × 22.047 × 4.173 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2390 kN, C0 4320 kN, Pu 230 kN, grease limiting speed 650 r/min, oil 830 r/min, mass about 72600 g. It is open, with one-piece machined brass cage (EM high-capacity design) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23984EMKD1 mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23984EMD1."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23984EMKD1 is the EM machined-brass-cage execution, listed with the ＊ ULTAGE new-generation mark."
      },
      {
        "q": "What do D1 and W33 mean on 23984EMKD1?",
        "a": "D1 is NTN's outer-ring lubrication feature: an annular groove with oil holes around the outer ring, aligned with a housing grease port so lubricant reaches both roller rows directly. 23984EMKD1 carries D1; W33 is the equivalent industry-spelled annular-groove-and-holes feature seen on other executions."
      },
      {
        "q": "How much misalignment and axial load can 23984EMKD1 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2390 kN C / 4320 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23984EMD1",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23984EMD1 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23984emkd1",
      "＊23984emkd1",
      "23984EMKD1"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23084B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23084B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3450,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 475,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 640,
    "weight_g": 157000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 420 mm shaft, NTN supplies 23084B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 640 r/min. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 150 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Grease/oil ratio: the 490 r/min limiting value is .77 of the 640 r/min oil value; heavy 150 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Never mount 23084B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 420 mm bore 23084B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 640 r/min needs drain and level design; flooding the 150 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 420 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 420 mm bearing, and drive-up procedures differ.",
      "The 3450/6400 kN ratings, 475 kN Pu and 157000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23084B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23084B?",
        "a": "23084B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3450 kN, C0 6400 kN, Pu 475 kN, grease limiting speed 490 r/min, oil 640 r/min, mass about 157000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23084B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23084BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23084B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23084B?",
        "a": "23084B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23084B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3450 kN C / 6400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23084BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23084BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23084b",
      "23084B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23084BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23084BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3450,
    "static_load_kN": 6400,
    "fatigue_load_limit_kN": 475,
    "limiting_speed_rpm": 490,
    "max_rpm": 490,
    "speed_oil_rpm": 640,
    "weight_g": 152000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23084BK denotes the 420 mm bore spherical roller bearing (3450 kN C / 6400 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 150 mm width follow the general plan. The 100.0 mm radial section over the 420 mm bore carries two roller rows; capacity per millimetre of bore is about 8.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. The 100.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 150 mm-wide ring seats fully on both sides. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 420 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 420 mm bore 23084BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23084BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 420×620 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 150 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 490 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23084B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 3450/6400 kN ratings, 475 kN Pu and 152000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23084BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23084BK?",
        "a": "23084BK is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 150 mm width (16.535 × 24.409 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3450 kN, C0 6400 kN, Pu 475 kN, grease limiting speed 490 r/min, oil 640 r/min, mass about 152000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23084BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23084B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23084BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23084BK?",
        "a": "23084BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23084BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3450 kN C / 6400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23084B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23084B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23084bk",
      "23084BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24084B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24084B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4300,
    "static_load_kN": 8450,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 440,
    "max_rpm": 440,
    "speed_oil_rpm": 570,
    "weight_g": 210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 24084B identifies a 420×620×200 mm (16.535 × 24.409 × 7.874 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 420 mm bore; the 200 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Two symmetric roller rows share the load: C 4300 kN, C0 8450 kN (C0/C ≈ 1.97), with useful axial capacity in either direction alongside the dominant radial load. 420 mm bore is 16.535 in and 620 mm OD is 24.409 in; the ISO 15 envelope swaps between brands, but the 4300/8450 kN ratings and cage design are NTN 2203E values. Never mount 24084B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 420 mm bore 24084B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4300 kN rating no longer applies.",
      "Never substitute 24084B by envelope alone: the 8450 kN C0 and 470 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 440 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 4300/8450 kN ratings, 470 kN Pu and 210000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24084B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24084B?",
        "a": "24084B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 200 mm width (16.535 × 24.409 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4300 kN, C0 8450 kN, Pu 470 kN, grease limiting speed 440 r/min, oil 570 r/min, mass about 210000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24084B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24084BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24084B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24084B?",
        "a": "24084B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24084B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4300 kN C / 8450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24084BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24084BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24084b",
      "24084B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24084BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24084BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 620,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4300,
    "static_load_kN": 8450,
    "fatigue_load_limit_kN": 470,
    "limiting_speed_rpm": 440,
    "max_rpm": 440,
    "speed_oil_rpm": 570,
    "weight_g": 207000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24084BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 420×620×200 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24084BK30 is assembled exactly in that order. Suffix reading on 24084BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Catalogue mass 207000 g (207.00 kg) for the 420×620×200 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 420 mm bore 24084BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24084BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 24084BK30 by envelope alone: the 8450 kN C0 and 470 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 200 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4300/8450 kN ratings, 470 kN Pu and 207000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24084BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24084BK30?",
        "a": "24084BK30 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 620 mm OD and 200 mm width (16.535 × 24.409 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4300 kN, C0 8450 kN, Pu 470 kN, grease limiting speed 440 r/min, oil 570 r/min, mass about 207000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24084BK30 mounts on a matching adapter or withdrawal sleeve on a plain 420 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24084B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24084BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24084BK30?",
        "a": "24084BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24084BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4300 kN C / 8450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24084B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24084B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24084bk30",
      "24084BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23184B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23184B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9950,
    "fatigue_load_limit_kN": 680,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 354000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23184B with a cylindrical bore and plain outer ring (no D1/W33 groove): 420 mm bore, 700 mm OD, 224 mm width, rated 410 r/min on grease. Numbering ties 23184B to its envelope and execution: same-number EA versus EM or plain variants share the 420 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. The 140.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 224 mm-wide ring seats fully on both sides. Fit the cylindrical-bore 23184B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 420 mm bore 23184B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23184B and its tapered-bore counterpart 23184BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 224 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 23184B by envelope alone: the 9950 kN C0 and 680 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 5800/9950 kN ratings, 680 kN Pu and 354000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23184B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23184B?",
        "a": "23184B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 224 mm width (16.535 × 27.559 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9950 kN, Pu 680 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 354000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23184B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23184BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23184B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23184B?",
        "a": "23184B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23184B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23184BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23184BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23184b",
      "23184B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23184BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23184BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 224,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 9950,
    "fatigue_load_limit_kN": 680,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 343000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23184BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 420×700×224 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 420 mm bore; the 224 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 680 kN is the catalogue fatigue load limit for 23184BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 23184BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 420 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 420 mm bore 23184BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23184BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23184BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5800/9950 kN ratings, 680 kN Pu and 343000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23184BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23184BK?",
        "a": "23184BK is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 224 mm width (16.535 × 27.559 × 8.819 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 9950 kN, Pu 680 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 343000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23184BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23184B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23184BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23184BK?",
        "a": "23184BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23184BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 9950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23184B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23184B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23184bk",
      "23184BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24184B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24184B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6850,
    "static_load_kN": 12200,
    "fatigue_load_limit_kN": 755,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 440000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24184B is the basic execution of NTN's spherical roller range for a 420 mm shaft — 6850 kN basic dynamic capacity in a 440000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 700 mm OD / 280 mm width follow the general plan. The cylindrical bore fits a machined 420 mm shaft seat directly; the same envelope in 24184BK30 (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 24184B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fit the cylindrical-bore 24184B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 420 mm bore 24184B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24184B by envelope alone: the 12200 kN C0 and 755 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6850 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24184B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 420×700 mm envelope is identical.",
      "The 6850/12200 kN ratings, 755 kN Pu and 440000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24184B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24184B?",
        "a": "24184B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 280 mm width (16.535 × 27.559 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6850 kN, C0 12200 kN, Pu 755 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 440000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24184B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24184BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24184B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24184B?",
        "a": "24184B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24184B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6850 kN C / 12200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24184BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24184BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24184b",
      "24184B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24184BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24184BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 700,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6850,
    "static_load_kN": 12200,
    "fatigue_load_limit_kN": 755,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 433000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24184BK30 denotes the 420 mm bore spherical roller bearing (6850 kN C / 12200 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 420 mm (two-digit code ×5, with the 00–03 exception table), and 700 mm OD / 280 mm width follow the general plan. Open by design, 24184BK30 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. 420 mm bore is 16.535 in and 700 mm OD is 27.559 in; the ISO 15 envelope swaps between brands, but the 6850/12200 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 420 mm bore 24184BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24184BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24184B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 410 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6850 kN rating no longer applies.",
      "The 6850/12200 kN ratings, 755 kN Pu and 433000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24184BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24184BK30?",
        "a": "24184BK30 is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 700 mm OD and 280 mm width (16.535 × 27.559 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6850 kN, C0 12200 kN, Pu 755 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 433000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24184BK30 mounts on a matching adapter or withdrawal sleeve on a plain 420 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24184B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24184BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24184BK30?",
        "a": "24184BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24184BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6850 kN C / 12200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24184B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24184B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24184bk30",
      "24184BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23284B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23284B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 760,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 820,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 544000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23284B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 420×760×272 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23284B is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Speed planning: 380 r/min grease limiting speed is the cage/kinematic ceiling and 490 r/min is the oil-lubricated value for the 420 mm bore; vibrating screens rarely approach either and are load/cage limited instead. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 420 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 420 mm bore 23284B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23284B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 420×760 mm envelope is identical.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 23284B by envelope alone: the 12000 kN C0 and 820 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23284B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 7300/12000 kN ratings, 820 kN Pu and 544000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23284B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23284B?",
        "a": "23284B is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 760 mm OD and 272 mm width (16.535 × 29.921 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 12000 kN, Pu 820 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 544000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23284B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23284BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23284B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23284B?",
        "a": "23284B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23284B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23284BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23284BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23284b",
      "23284B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23284BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23284BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 420,
    "D_mm": 760,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 820,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 528000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23284BK denotes the 420 mm bore spherical roller bearing (7300 kN C / 12000 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 420×760 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. NTN prints two speeds for 23284BK: 380 r/min grease and 490 r/min oil — the gap of 110 r/min reflects oil cooling of the heavy roller set. Grease/oil ratio: the 380 r/min limiting value is .78 of the 490 r/min oil value; heavy 272 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 420 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 420 mm bore 23284BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23284B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 420 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23284B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 7300/12000 kN ratings, 820 kN Pu and 528000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23284BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23284BK?",
        "a": "23284BK is an NTN double-row spherical roller bearing to ISO 15: 420 mm bore, 760 mm OD and 272 mm width (16.535 × 29.921 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 12000 kN, Pu 820 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 528000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23284BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23284B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23284BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23284BK?",
        "a": "23284BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23284BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23284B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23284B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23284bk",
      "23284BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23988-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23988",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4700,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "speed_oil_rpm": 650,
    "weight_g": 101000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23988 identifies a 440×600×118 mm (17.323 × 23.622 × 4.646 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 440 mm (two-digit code ×5, with the 00–03 exception table), and 600 mm OD / 118 mm width follow the general plan. Pu 325 kN is the catalogue fatigue load limit for 23988, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Equivalent-load planning keeps a radial plus moderate axial combination on 23988; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 118 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 440 mm bore 23988 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 23988 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×600 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 118 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Do not confuse EA and EM at the same number: 23988 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×600 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23988 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2260/4700 kN ratings, 325 kN Pu and 101000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23988 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23988?",
        "a": "23988 is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 600 mm OD and 118 mm width (17.323 × 23.622 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4700 kN, Pu 325 kN, grease limiting speed 500 r/min, oil 650 r/min, mass about 101000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23988 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23988K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23988 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23988?",
        "a": "23988 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23988 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2260 kN C / 4700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23988",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23988-CCK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23988K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23988K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23988",
      "23988-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23988K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23988K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 600,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2260,
    "static_load_kN": 4700,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 500,
    "max_rpm": 500,
    "speed_oil_rpm": 650,
    "weight_g": 98000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23988K is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 440×600×118 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 440×600 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Two symmetric roller rows share the load: C 2260 kN, C0 4700 kN (C0/C ≈ 2.08), with useful axial capacity in either direction alongside the dominant radial load. With about 5.1 kN of C per millimetre of the 440 mm bore, 23988K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 440 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 440 mm bore 23988K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23988K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 500 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2260 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 2260/4700 kN ratings, 325 kN Pu and 98000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23988K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23988K?",
        "a": "23988K is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 600 mm OD and 118 mm width (17.323 × 23.622 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2260 kN, C0 4700 kN, Pu 325 kN, grease limiting speed 500 r/min, oil 650 r/min, mass about 98000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23988K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23988."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23988K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23988K?",
        "a": "23988K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23988K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2260 kN C / 4700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23988-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23988-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23988k",
      "23988K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23088B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23088B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3650,
    "static_load_kN": 6850,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 470,
    "max_rpm": 470,
    "speed_oil_rpm": 610,
    "weight_g": 181000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23088B with a cylindrical bore and plain outer ring (no D1/W33 groove): 440 mm bore, 650 mm OD, 157 mm width, rated 470 r/min on grease. Numbering ties 23088B to its envelope and execution: same-number EA versus EM or plain variants share the 440 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 530 kN is the catalogue fatigue load limit for 23088B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Speed planning: 470 r/min grease limiting speed is the cage/kinematic ceiling and 610 r/min is the oil-lubricated value for the 440 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 440 mm bore 23088B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 23088B by envelope alone: the 6850 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23088B by envelope alone: the 6850 kN C0 and 530 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23088B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 3650/6850 kN ratings, 530 kN Pu and 181000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23088B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23088B?",
        "a": "23088B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 6850 kN, Pu 530 kN, grease limiting speed 470 r/min, oil 610 r/min, mass about 181000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23088B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23088BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23088B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23088B?",
        "a": "23088B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23088B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 6850 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23088BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23088BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23088b",
      "23088B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23088BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23088BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 157,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3650,
    "static_load_kN": 6850,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 470,
    "max_rpm": 470,
    "speed_oil_rpm": 610,
    "weight_g": 175000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23088BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 440 mm bore, 650 mm OD, 157 mm width, rated 470 r/min on grease. Reading the full code: the number gives the 440×650 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 530 kN against C0 6850 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23088BK moves with cleanliness far more than with small C variations. Never mount 23088BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 650 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 440 mm bore 23088BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23088BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 23088BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×650 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 23088BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×650 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23088BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3650/6850 kN ratings, 530 kN Pu and 175000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23088BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23088BK?",
        "a": "23088BK is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 157 mm width (17.323 × 25.591 × 6.181 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3650 kN, C0 6850 kN, Pu 530 kN, grease limiting speed 470 r/min, oil 610 r/min, mass about 175000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23088BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23088B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23088BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23088BK?",
        "a": "23088BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23088BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3650 kN C / 6850 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23088B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23088B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23088bk",
      "23088BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24088B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24088B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4800,
    "static_load_kN": 9450,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 540,
    "weight_g": 245000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24088B is the basic execution of NTN's spherical roller range for a 440 mm shaft — 4800 kN basic dynamic capacity in a 245000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 440 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 212 mm width follow the general plan. NTN prints two speeds for 24088B: 420 r/min grease and 540 r/min oil — the gap of 120 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 1.97 (9450/4800 kN) reflects the heavy static and shock proportioning of 24088B; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 440 mm bore 24088B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24088B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24088B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 540 r/min needs drain and level design; flooding the 212 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4800/9450 kN ratings, 530 kN Pu and 245000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24088B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24088B?",
        "a": "24088B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 212 mm width (17.323 × 25.591 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4800 kN, C0 9450 kN, Pu 530 kN, grease limiting speed 420 r/min, oil 540 r/min, mass about 245000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24088B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24088BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24088B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24088B?",
        "a": "24088B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24088B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4800 kN C / 9450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24088BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24088BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24088b",
      "24088B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24088BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24088BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 650,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4800,
    "static_load_kN": 9450,
    "fatigue_load_limit_kN": 530,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 540,
    "weight_g": 241000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 24088BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 440 mm bore, 650 mm OD, 212 mm width, rated 420 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24088BK30 is assembled exactly in that order. Two symmetric roller rows share the load: C 4800 kN, C0 9450 kN (C0/C ≈ 1.97), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 420 r/min grease limiting speed is the cage/kinematic ceiling and 540 r/min is the oil-lubricated value for the 440 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24088BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 440 mm bore 24088BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24088B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 420 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4800 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 4800/9450 kN ratings, 530 kN Pu and 241000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24088BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24088BK30?",
        "a": "24088BK30 is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 650 mm OD and 212 mm width (17.323 × 25.591 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4800 kN, C0 9450 kN, Pu 530 kN, grease limiting speed 420 r/min, oil 540 r/min, mass about 241000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24088BK30 mounts on a matching adapter or withdrawal sleeve on a plain 440 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24088B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24088BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24088BK30?",
        "a": "24088BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24088BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4800 kN C / 9450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24088B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24088B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24088bk30",
      "24088BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23188B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23188B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 226,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 10100,
    "fatigue_load_limit_kN": 685,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 370000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23188B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 440×720×226 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23188B is assembled exactly in that order. At 5800 kN C and 370000 g mass the 23100 series part is built for shock and vibration; the 226 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 370000 g (370.00 kg) for the 440×720×226 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 23188B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 440 mm bore 23188B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 500 r/min needs drain and level design; flooding the 226 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23188B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 390 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 5800/10100 kN ratings, 685 kN Pu and 370000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23188B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23188B?",
        "a": "23188B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 226 mm width (17.323 × 28.346 × 8.898 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 10100 kN, Pu 685 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 370000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23188B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23188BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23188B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23188B?",
        "a": "23188B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23188B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 10100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23188BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23188BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23188b",
      "23188B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23188BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23188BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 226,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 10100,
    "fatigue_load_limit_kN": 685,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 358000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23188BK is the basic execution of NTN's spherical roller range for a 440 mm shaft — 5800 kN basic dynamic capacity in a 358000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 23188BK is assembled exactly in that order. Open by design, 23188BK requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 390 r/min grease limiting speed is the cage/kinematic ceiling and 500 r/min is the oil-lubricated value for the 440 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 23188BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 440 mm bore 23188BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23188BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "The 5800/10100 kN ratings, 685 kN Pu and 358000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23188BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23188BK?",
        "a": "23188BK is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 226 mm width (17.323 × 28.346 × 8.898 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 10100 kN, Pu 685 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 358000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23188BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23188B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23188BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23188BK?",
        "a": "23188BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23188BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 10100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23188B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23188B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23188bk",
      "23188BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24188B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24188B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7200,
    "static_load_kN": 13100,
    "fatigue_load_limit_kN": 715,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 456000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24188B denotes the 440 mm bore spherical roller bearing (7200 kN C / 13100 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. Numbering ties 24188B to its envelope and execution: same-number EA versus EM or plain variants share the 440 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 715 kN against C0 13100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24188B moves with cleanliness far more than with small C variations. Never mount 24188B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 440 mm bore 24188B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7200 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 24188B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×720 mm envelope is identical.",
      "The cylindrical-bore 24188B and its tapered-bore counterpart 24188BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "The 7200/13100 kN ratings, 715 kN Pu and 456000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24188B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24188B?",
        "a": "24188B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 280 mm width (17.323 × 28.346 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7200 kN, C0 13100 kN, Pu 715 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 456000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24188B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24188BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24188B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24188B?",
        "a": "24188B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24188B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7200 kN C / 13100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24188BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24188BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24188b",
      "24188B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24188BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24188BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 720,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7200,
    "static_load_kN": 13100,
    "fatigue_load_limit_kN": 715,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 500,
    "weight_g": 449000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24188BK30 denotes the 440 mm bore spherical roller bearing (7200 kN C / 13100 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 440 mm (two-digit code ×5, with the 00–03 exception table), and 720 mm OD / 280 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 449000 g (449.00 kg) for the 440×720×280 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 24188BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 440 mm bore 24188BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 390 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7200 kN rating no longer applies.",
      "Never substitute 24188BK30 by envelope alone: the 13100 kN C0 and 715 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "The 7200/13100 kN ratings, 715 kN Pu and 449000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24188BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24188BK30?",
        "a": "24188BK30 is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 720 mm OD and 280 mm width (17.323 × 28.346 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7200 kN, C0 13100 kN, Pu 715 kN, grease limiting speed 390 r/min, oil 500 r/min, mass about 449000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24188BK30 mounts on a matching adapter or withdrawal sleeve on a plain 440 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24188B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24188BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24188BK30?",
        "a": "24188BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24188BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7200 kN C / 13100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24188B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24188B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24188bk30",
      "24188BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23288B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23288B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 790,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 12800,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 600000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23288B identifies a 440×790×280 mm (17.323 × 31.102 × 11.024 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 440×790 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Two symmetric roller rows share the load: C 7700 kN, C0 12800 kN (C0/C ≈ 1.66), with useful axial capacity in either direction alongside the dominant radial load. 440 mm bore is 17.323 in and 790 mm OD is 31.102 in; the ISO 15 envelope swaps between brands, but the 7700/12800 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 23288B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 440 mm bore 23288B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23288B and its tapered-bore counterpart 23288BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23288B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 440×790 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 440 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 7700/12800 kN ratings, 870 kN Pu and 600000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23288B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23288B?",
        "a": "23288B is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 790 mm OD and 280 mm width (17.323 × 31.102 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 12800 kN, Pu 870 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 600000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23288B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23288BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23288B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23288B?",
        "a": "23288B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23288B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 12800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23288BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23288BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23288b",
      "23288B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23288BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23288BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 440,
    "D_mm": 790,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 12800,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 582000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23288BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 440 mm bore, 790 mm OD, 280 mm width, rated 360 r/min on grease. Numbering ties 23288BK to its envelope and execution: same-number EA versus EM or plain variants share the 440 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 23288BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.66 (12800/7700 kN) reflects the heavy static and shock proportioning of 23288BK; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 280 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 440 mm bore 23288BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 440 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23288BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 280 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 7700/12800 kN ratings, 870 kN Pu and 582000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23288BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23288BK?",
        "a": "23288BK is an NTN double-row spherical roller bearing to ISO 15: 440 mm bore, 790 mm OD and 280 mm width (17.323 × 31.102 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 12800 kN, Pu 870 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 582000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23288BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23288B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23288BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23288BK?",
        "a": "23288BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23288BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 12800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23288B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23288B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23288bk",
      "23288BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23992-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23992",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4950,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "speed_oil_rpm": 620,
    "weight_g": 107000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23992 is the basic execution of NTN's spherical roller range for a 460 mm shaft — 2340 kN basic dynamic capacity in a 107000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 620 mm OD / 118 mm width follow the general plan. The 80.0 mm radial section over the 460 mm bore carries two roller rows; capacity per millimetre of bore is about 5.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Selection: the C0/C ratio of 2.12 (4950/2340 kN) reflects the heavy static and shock proportioning of 23992; size the equivalent load at the required L10 with shock factor for the application. Never mount 23992 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 460 mm bore 23992 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 23992 and its tapered-bore counterpart 23992K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 23992 and its tapered-bore counterpart 23992K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 2340/4950 kN ratings, 325 kN Pu and 107000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23992 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23992?",
        "a": "23992 is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 620 mm OD and 118 mm width (18.11 × 24.409 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4950 kN, Pu 325 kN, grease limiting speed 480 r/min, oil 620 r/min, mass about 107000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23992 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23992K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23992 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23992?",
        "a": "23992 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23992 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23992",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23992-CAK-W33",
        "equiv_brand": "SKF",
        "level": "full",
        "note": "Identical ISO 15 envelope, seal and ratings band — standard interchange; re-verify precision class and clearance per supplier."
      },
      {
        "equiv_sku": "23992K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23992K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23992",
      "23992-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23992K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23992K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 620,
    "B_mm": 118,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2340,
    "static_load_kN": 4950,
    "fatigue_load_limit_kN": 325,
    "limiting_speed_rpm": 480,
    "max_rpm": 480,
    "speed_oil_rpm": 620,
    "weight_g": 104000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23992K identifies a 460×620×118 mm (18.11 × 24.409 × 4.646 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 460×620 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 460 mm bore assembly. Selection: the C0/C ratio of 2.12 (4950/2340 kN) reflects the heavy static and shock proportioning of 23992K; size the equivalent load at the required L10 with shock factor for the application. Never mount 23992K by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 620 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 460 mm bore 23992K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2340 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23992: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23992: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 23992K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 460×620 mm envelope is identical.",
      "The 2340/4950 kN ratings, 325 kN Pu and 104000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23992K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23992K?",
        "a": "23992K is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 620 mm OD and 118 mm width (18.11 × 24.409 × 4.646 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2340 kN, C0 4950 kN, Pu 325 kN, grease limiting speed 480 r/min, oil 620 r/min, mass about 104000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23992K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23992."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23992K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23992K?",
        "a": "23992K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23992K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2340 kN C / 4950 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23992-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23992-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23992k",
      "23992K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23092B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23092B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 7450,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 580,
    "weight_g": 206000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23092B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 460×680×163 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 680 mm OD / 163 mm width follow the general plan. The cylindrical bore fits a machined 460 mm shaft seat directly; the same envelope in 23092BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 23092B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 460 mm bore 23092B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4000 kN rating no longer applies.",
      "Oil relubrication toward 580 r/min needs drain and level design; flooding the 163 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 23092B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 460×680 mm envelope is identical.",
      "The 4000/7450 kN ratings, 560 kN Pu and 206000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23092B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23092B?",
        "a": "23092B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 7450 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 580 r/min, mass about 206000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23092B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23092BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23092B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23092B?",
        "a": "23092B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23092B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 7450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23092BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23092BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23092b",
      "23092B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23092BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23092BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 163,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4000,
    "static_load_kN": 7450,
    "fatigue_load_limit_kN": 560,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 580,
    "weight_g": 200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23092BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 460 mm bore, 680 mm OD, 163 mm width, rated 450 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 460 mm bore; the 163 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Open by design, 23092BK requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 450 r/min limiting value is .78 of the 580 r/min oil value; heavy 163 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 163 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 460 mm bore 23092BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23092BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23092B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 4000 kN rating no longer applies.",
      "The 4000/7450 kN ratings, 560 kN Pu and 200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23092BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23092BK?",
        "a": "23092BK is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 163 mm width (18.11 × 26.772 × 6.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4000 kN, C0 7450 kN, Pu 560 kN, grease limiting speed 450 r/min, oil 580 r/min, mass about 200000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23092BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23092B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23092BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23092BK?",
        "a": "23092BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23092BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4000 kN C / 7450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23092B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23092B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23092bk",
      "23092BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24092B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24092B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 10200,
    "fatigue_load_limit_kN": 590,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 510,
    "weight_g": 276000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24092B denotes the 460 mm bore spherical roller bearing (5100 kN C / 10200 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 460 mm bore; the 218 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 390 r/min limiting value is .76 of the 510 r/min oil value; heavy 218 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 460 mm bore 24092B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 510 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24092B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 5100/10200 kN ratings, 590 kN Pu and 276000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24092B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24092B?",
        "a": "24092B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 218 mm width (18.11 × 26.772 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 10200 kN, Pu 590 kN, grease limiting speed 390 r/min, oil 510 r/min, mass about 276000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24092B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24092BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24092B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24092B?",
        "a": "24092B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24092B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 10200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24092BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24092BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24092b",
      "24092B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24092BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24092BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 680,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5100,
    "static_load_kN": 10200,
    "fatigue_load_limit_kN": 590,
    "limiting_speed_rpm": 390,
    "max_rpm": 390,
    "speed_oil_rpm": 510,
    "weight_g": 272000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24092BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 460×680×218 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24092BK30 is assembled exactly in that order. The 110.0 mm radial section over the 460 mm bore carries two roller rows; capacity per millimetre of bore is about 11.1 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 11.1 kN of C per millimetre of the 460 mm bore, 24092BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 460 mm bore 24092BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 510 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24092BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5100 kN rating no longer applies.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 24092B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 5100/10200 kN ratings, 590 kN Pu and 272000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24092BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24092BK30?",
        "a": "24092BK30 is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 680 mm OD and 218 mm width (18.11 × 26.772 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5100 kN, C0 10200 kN, Pu 590 kN, grease limiting speed 390 r/min, oil 510 r/min, mass about 272000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24092BK30 mounts on a matching adapter or withdrawal sleeve on a plain 460 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24092B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24092BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24092BK30?",
        "a": "24092BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24092BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5100 kN C / 10200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24092B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24092B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24092bk30",
      "24092BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23192B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23192B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6350,
    "static_load_kN": 11400,
    "fatigue_load_limit_kN": 775,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 443000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23192B identifies a 460×760×240 mm (18.11 × 29.921 × 9.449 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23192B to its envelope and execution: same-number EA versus EM or plain variants share the 460 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Two symmetric roller rows share the load: C 6350 kN, C0 11400 kN (C0/C ≈ 1.80), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 360 r/min grease limiting speed is the cage/kinematic ceiling and 470 r/min is the oil-lubricated value for the 460 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 460 mm bore 23192B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23192B by envelope alone: the 11400 kN C0 and 775 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23192B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Oil relubrication toward 470 r/min needs drain and level design; flooding the 240 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 460 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 6350/11400 kN ratings, 775 kN Pu and 443000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23192B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23192B?",
        "a": "23192B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 240 mm width (18.11 × 29.921 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6350 kN, C0 11400 kN, Pu 775 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 443000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23192B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23192BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23192B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23192B?",
        "a": "23192B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23192B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6350 kN C / 11400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23192BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23192BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23192b",
      "23192B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23192BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23192BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 240,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6350,
    "static_load_kN": 11400,
    "fatigue_load_limit_kN": 775,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 429000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23192BK denotes the 460 mm bore spherical roller bearing (6350 kN C / 11400 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 460×760 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 23192BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. 460 mm bore is 18.11 in and 760 mm OD is 29.921 in; the ISO 15 envelope swaps between brands, but the 6350/11400 kN ratings and cage design are NTN 2203E values. Mount 23192BK on its adapter or withdrawal sleeve on the 460 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 460 mm bore 23192BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23192BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 460 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23192BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 240 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 6350/11400 kN ratings, 775 kN Pu and 429000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23192BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23192BK?",
        "a": "23192BK is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 240 mm width (18.11 × 29.921 × 9.449 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6350 kN, C0 11400 kN, Pu 775 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 429000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23192BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23192B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23192BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23192BK?",
        "a": "23192BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23192BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6350 kN C / 11400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23192B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23192B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23192bk",
      "23192BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24192B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24192B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7900,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 805,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 550000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24192B belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 760 mm OD / 300 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Selection: the C0/C ratio of 1.84 (14500/7900 kN) reflects the heavy static and shock proportioning of 24192B; size the equivalent load at the required L10 with shock factor for the application. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 460 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 460 mm bore 24192B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 470 r/min needs drain and level design; flooding the 300 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 300 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 24192B by envelope alone: the 14500 kN C0 and 805 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 7900/14500 kN ratings, 805 kN Pu and 550000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24192B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24192B?",
        "a": "24192B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 300 mm width (18.11 × 29.921 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7900 kN, C0 14500 kN, Pu 805 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 550000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24192B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24192BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24192B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24192B?",
        "a": "24192B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24192B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7900 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24192BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24192BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24192b",
      "24192B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24192BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24192BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 760,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7900,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 805,
    "limiting_speed_rpm": 360,
    "max_rpm": 360,
    "speed_oil_rpm": 470,
    "weight_g": 541000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24192BK30 belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 460 mm (two-digit code ×5, with the 00–03 exception table), and 760 mm OD / 300 mm width follow the general plan. NTN prints two speeds for 24192BK30: 360 r/min grease and 470 r/min oil — the gap of 110 r/min reflects oil cooling of the heavy roller set. 460 mm bore is 18.11 in and 760 mm OD is 29.921 in; the ISO 15 envelope swaps between brands, but the 7900/14500 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 24192BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 460 mm bore 24192BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 24192BK30 by envelope alone: the 14500 kN C0 and 805 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 360 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 470 r/min needs drain and level design; flooding the 300 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 7900/14500 kN ratings, 805 kN Pu and 541000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24192BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24192BK30?",
        "a": "24192BK30 is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 760 mm OD and 300 mm width (18.11 × 29.921 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7900 kN, C0 14500 kN, Pu 805 kN, grease limiting speed 360 r/min, oil 470 r/min, mass about 541000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24192BK30 mounts on a matching adapter or withdrawal sleeve on a plain 460 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24192B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24192BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24192BK30?",
        "a": "24192BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24192BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7900 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24192B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24192B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24192bk30",
      "24192BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23292B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23292B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 830,
    "B_mm": 296,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8650,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 925,
    "limiting_speed_rpm": 340,
    "max_rpm": 340,
    "speed_oil_rpm": 440,
    "weight_g": 704000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23292B is the basic execution of NTN's spherical roller range for a 460 mm shaft — 8650 kN basic dynamic capacity in a 704000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23292B is assembled exactly in that order. The cylindrical bore fits a machined 460 mm shaft seat directly; the same envelope in 23292BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 704000 g (704.00 kg) for the 460×830×296 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 460 mm bore 23292B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 340 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 296 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23292B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Do not confuse EA and EM at the same number: 23292B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 460×830 mm envelope is identical.",
      "The 8650/14500 kN ratings, 925 kN Pu and 704000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23292B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23292B?",
        "a": "23292B is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 830 mm OD and 296 mm width (18.11 × 32.677 × 11.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8650 kN, C0 14500 kN, Pu 925 kN, grease limiting speed 340 r/min, oil 440 r/min, mass about 704000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23292B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23292BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23292B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23292B?",
        "a": "23292B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23292B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8650 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23292BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23292BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23292b",
      "23292B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23292BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23292BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 460,
    "D_mm": 830,
    "B_mm": 296,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8650,
    "static_load_kN": 14500,
    "fatigue_load_limit_kN": 925,
    "limiting_speed_rpm": 340,
    "max_rpm": 340,
    "speed_oil_rpm": 440,
    "weight_g": 683000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 23292BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 460 mm bore, 830 mm OD, 296 mm width, rated 340 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 23292BK is assembled exactly in that order. Pu 925 kN is the catalogue fatigue load limit for 23292BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 18.8 kN of C per millimetre of the 460 mm bore, 23292BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 23292BK on its adapter or withdrawal sleeve on the 460 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 460 mm bore 23292BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23292BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 23292BK by envelope alone: the 14500 kN C0 and 925 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 23292BK by envelope alone: the 14500 kN C0 and 925 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23292BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 8650/14500 kN ratings, 925 kN Pu and 683000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23292BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23292BK?",
        "a": "23292BK is an NTN double-row spherical roller bearing to ISO 15: 460 mm bore, 830 mm OD and 296 mm width (18.11 × 32.677 × 11.654 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8650 kN, C0 14500 kN, Pu 925 kN, grease limiting speed 340 r/min, oil 440 r/min, mass about 683000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23292BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23292B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23292BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23292BK?",
        "a": "23292BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23292BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8650 kN C / 14500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23292B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23292B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23292bk",
      "23292BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23996-NTN",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23996",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2590,
    "static_load_kN": 5500,
    "fatigue_load_limit_kN": 365,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 123000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23996 identifies a 480×650×128 mm (18.898 × 25.591 × 5.039 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 650 mm OD / 128 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23996; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 128 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 480 mm bore 23996 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23996 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 450 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23996 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×650 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 2590/5500 kN ratings, 365 kN Pu and 123000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23996 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23996?",
        "a": "23996 is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 650 mm OD and 128 mm width (18.898 × 25.591 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2590 kN, C0 5500 kN, Pu 365 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 123000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23996 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23996K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23996 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23996?",
        "a": "23996 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23996 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2590 kN C / 5500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23996",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 480×650×128 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "23996-CAK-W33",
        "equiv_brand": "SKF",
        "level": "partial",
        "note": "Same 480×650×128 mm envelope per ISO 15; catalogue load ratings differ by >10% — re-rate the application before substituting."
      },
      {
        "equiv_sku": "23996K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23996K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23996",
      "23996-NTN"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23996K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23996K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 650,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2590,
    "static_load_kN": 5500,
    "fatigue_load_limit_kN": 365,
    "limiting_speed_rpm": 450,
    "max_rpm": 450,
    "speed_oil_rpm": 590,
    "weight_g": 119000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23996K is the basic execution of NTN's spherical roller range for a 480 mm shaft — 2590 kN basic dynamic capacity in a 119000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 480 mm bore; the 128 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 5.4 kN of C per millimetre of the 480 mm bore, 23996K screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 480 mm bore 23996K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23996K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23996K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 128 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 2590/5500 kN ratings, 365 kN Pu and 119000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23996K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23996K?",
        "a": "23996K is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 650 mm OD and 128 mm width (18.898 × 25.591 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2590 kN, C0 5500 kN, Pu 365 kN, grease limiting speed 450 r/min, oil 590 r/min, mass about 119000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23996K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23996."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23996K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23996K?",
        "a": "23996K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23996K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2590 kN C / 5500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23996-NTN",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23996-NTN — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23996k",
      "23996K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23096B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23096B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4050,
    "static_load_kN": 7700,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 550,
    "weight_g": 217000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 23096B identifies a 480×700×165 mm (18.898 × 27.559 × 6.496 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 23096B to its envelope and execution: same-number EA versus EM or plain variants share the 480 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 570 kN against C0 7700 kN anchors the contamination derating; for dirty mining duty the adjusted life of 23096B moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 165 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 480 mm bore 23096B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23096B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 4050/7700 kN ratings, 570 kN Pu and 217000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23096B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23096B?",
        "a": "23096B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 165 mm width (18.898 × 27.559 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4050 kN, C0 7700 kN, Pu 570 kN, grease limiting speed 420 r/min, oil 550 r/min, mass about 217000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23096B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23096BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23096B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23096B?",
        "a": "23096B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23096B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4050 kN C / 7700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23096BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23096BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23096b",
      "23096B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23096BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23096BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4050,
    "static_load_kN": 7700,
    "fatigue_load_limit_kN": 570,
    "limiting_speed_rpm": 420,
    "max_rpm": 420,
    "speed_oil_rpm": 550,
    "weight_g": 209000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23096BK is the basic execution of NTN's spherical roller range for a 480 mm shaft — 4050 kN basic dynamic capacity in a 209000 g, open ISO 15 envelope. Reading the full code: the number gives the 480×700 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 480 mm bore assembly. Equivalent-load planning keeps a radial plus moderate axial combination on 23096BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 23096BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 420 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23096BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 420 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 23096BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×700 mm envelope is identical.",
      "The 4050/7700 kN ratings, 570 kN Pu and 209000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23096BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23096BK?",
        "a": "23096BK is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 165 mm width (18.898 × 27.559 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4050 kN, C0 7700 kN, Pu 570 kN, grease limiting speed 420 r/min, oil 550 r/min, mass about 209000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23096BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23096B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23096BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23096BK?",
        "a": "23096BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23096BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4050 kN C / 7700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23096B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23096B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23096bk",
      "23096BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24096B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24096B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5200,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 610,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 285000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24096B belongs to the 24000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 700 mm OD / 218 mm width follow the general plan. Two symmetric roller rows share the load: C 5200 kN, C0 10500 kN (C0/C ≈ 2.02), with useful axial capacity in either direction alongside the dominant radial load. Speed planning: 380 r/min grease limiting speed is the cage/kinematic ceiling and 490 r/min is the oil-lubricated value for the 480 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Fillet radii on shaft and housing must clear the ring chamfers of the 218 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 480 mm bore 24096B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24096B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 24096B by envelope alone: the 10500 kN C0 and 610 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5200/10500 kN ratings, 610 kN Pu and 285000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24096B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24096B?",
        "a": "24096B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 218 mm width (18.898 × 27.559 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5200 kN, C0 10500 kN, Pu 610 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 285000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24096B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24096BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24096B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24096B?",
        "a": "24096B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24096B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5200 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24096BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24096BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24096b",
      "24096B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24096BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24096BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 700,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5200,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 610,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 280000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "24096BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 480×700×218 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 24096BK30 is assembled exactly in that order. Two symmetric roller rows share the load: C 5200 kN, C0 10500 kN (C0/C ≈ 2.02), with useful axial capacity in either direction alongside the dominant radial load. Pu 610 kN against C0 10500 kN anchors the contamination derating; for dirty mining duty the adjusted life of 24096BK30 moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 24096BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 24096BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×700 mm envelope is identical.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24096BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 5200/10500 kN ratings, 610 kN Pu and 280000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24096BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24096BK30?",
        "a": "24096BK30 is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 700 mm OD and 218 mm width (18.898 × 27.559 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5200 kN, C0 10500 kN, Pu 610 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 280000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 24096BK30 mounts on a matching adapter or withdrawal sleeve on a plain 480 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24096B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24096BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24096BK30?",
        "a": "24096BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24096BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5200 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24096B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24096B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=214",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24096bk30",
      "24096BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23196B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23196B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 248,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6900,
    "static_load_kN": 12300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 492000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23196B is the basic execution of NTN's spherical roller range for a 480 mm shaft — 6900 kN basic dynamic capacity in a 492000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 23196B is assembled exactly in that order. NTN prints two speeds for 23196B: 350 r/min grease and 450 r/min oil — the gap of 100 r/min reflects oil cooling of the heavy roller set. 480 mm bore is 18.898 in and 790 mm OD is 31.102 in; the ISO 15 envelope swaps between brands, but the 6900/12300 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 248 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 23196B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6900 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 450 r/min needs drain and level design; flooding the 248 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 6900/12300 kN ratings, 860 kN Pu and 492000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23196B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23196B?",
        "a": "23196B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 248 mm width (18.898 × 31.102 × 9.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6900 kN, C0 12300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 492000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23196B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23196BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23196B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23196B?",
        "a": "23196B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23196B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6900 kN C / 12300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23196BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23196BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23196b",
      "23196B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23196BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23196BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 248,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6900,
    "static_load_kN": 12300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 477000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 480 mm shaft, NTN supplies 23196BK: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 450 r/min. Numbering ties 23196BK to its envelope and execution: same-number EA versus EM or plain variants share the 480 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. The 155.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 248 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 480 mm bore 23196BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23196BK by envelope alone: the 12300 kN C0 and 860 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23196B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 23196BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 23196BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 6900/12300 kN ratings, 860 kN Pu and 477000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23196BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23196BK?",
        "a": "23196BK is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 248 mm width (18.898 × 31.102 × 9.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6900 kN, C0 12300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 477000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23196BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23196B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23196BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23196BK?",
        "a": "23196BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23196BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6900 kN C / 12300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23196B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23196B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23196bk",
      "23196BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24196B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24196B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8250,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 608000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 480 mm shaft, NTN supplies 24196B: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 450 r/min. Numbering ties 24196B to its envelope and execution: same-number EA versus EM or plain variants share the 480 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 8250 kN C and 608000 g mass the 24100 series part is built for shock and vibration; the 308 mm-wide ring needs square abutments to keep both rows equally loaded. With about 17.2 kN of C per millimetre of the 480 mm bore, 24196B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fillet radii on shaft and housing must clear the ring chamfers of the 308 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 480 mm bore 24196B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 480 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24196B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 8250/15300 kN ratings, 860 kN Pu and 608000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24196B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24196B?",
        "a": "24196B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 308 mm width (18.898 × 31.102 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8250 kN, C0 15300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 608000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "24196B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 24196BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24196B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24196B?",
        "a": "24196B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24196B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8250 kN C / 15300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24196BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 24196BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24196b",
      "24196B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "24196BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 24196BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 790,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8250,
    "static_load_kN": 15300,
    "fatigue_load_limit_kN": 860,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 600000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 24196BK30 denotes the 480 mm bore spherical roller bearing (8250 kN C / 15300 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 790 mm OD / 308 mm width follow the general plan. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 480 mm bore assembly. Catalogue mass 600000 g (600.00 kg) for the 480×790×308 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Never mount 24196BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 790 mm race.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 480 mm bore 24196BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 24196BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 24196BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 24196BK30 by envelope alone: the 15300 kN C0 and 860 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 24196BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 480×790 mm envelope is identical.",
      "The 8250/15300 kN ratings, 860 kN Pu and 600000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 24196BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 24196BK30?",
        "a": "24196BK30 is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 790 mm OD and 308 mm width (18.898 × 31.102 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8250 kN, C0 15300 kN, Pu 860 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 600000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 24196BK30 mounts on a matching adapter or withdrawal sleeve on a plain 480 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 24196B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 24196BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 24196BK30?",
        "a": "24196BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 24196BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8250 kN C / 15300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "24196B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 24196B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "24196bk30",
      "24196BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23296B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23296B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 870,
    "B_mm": 310,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9200,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 814000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 23296B denotes the 480 mm bore spherical roller bearing (9200 kN C / 15500 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 480×870 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 23296B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 480 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 480 mm bore 23296B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 23296B by envelope alone: the 15500 kN C0 and 1000 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 310 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9200 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 480 mm bearing, and drive-up procedures differ.",
      "The 9200/15500 kN ratings, 1000 kN Pu and 814000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23296B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23296B?",
        "a": "23296B is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 870 mm OD and 310 mm width (18.898 × 34.252 × 12.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9200 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 814000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "23296B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 23296BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23296B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23296B?",
        "a": "23296B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23296B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9200 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23296BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 23296BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23296b",
      "23296B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "23296BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 23296BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 480,
    "D_mm": 870,
    "B_mm": 310,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9200,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 790000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "23296BK is the basic execution of NTN's spherical roller range for a 480 mm shaft — 9200 kN basic dynamic capacity in a 790000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 480 mm (two-digit code ×5, with the 00–03 exception table), and 870 mm OD / 310 mm width follow the general plan. The 195.0 mm radial section over the 480 mm bore carries two roller rows; capacity per millimetre of bore is about 19.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 23296BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 23296BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 480 mm bore 23296BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 310 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 310 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23296B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 23296B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 9200/15500 kN ratings, 1000 kN Pu and 790000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 23296BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 23296BK?",
        "a": "23296BK is an NTN double-row spherical roller bearing to ISO 15: 480 mm bore, 870 mm OD and 310 mm width (18.898 × 34.252 × 12.205 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9200 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 790000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 23296BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 23296B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 23296BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 23296BK?",
        "a": "23296BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 23296BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9200 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "23296B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 23296B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "23296bk",
      "23296BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-500",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/500",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2640,
    "static_load_kN": 5600,
    "fatigue_load_limit_kN": 460,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 131000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 239/500 denotes the 500 mm bore spherical roller bearing (2640 kN C / 5600 kN C0) in the 23900 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23900 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 670 mm OD / 128 mm width follow the general plan. Pu 460 kN is the catalogue fatigue load limit for 239/500, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 85.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 128 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/500 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 500 mm bore 239/500 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 239/500 and its tapered-bore counterpart 239/500K share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/500 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/500 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 2640/5600 kN ratings, 460 kN Pu and 131000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/500 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/500?",
        "a": "239/500 is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 670 mm OD and 128 mm width (19.685 × 26.378 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2640 kN, C0 5600 kN, Pu 460 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 131000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/500 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/500K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/500 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/500?",
        "a": "239/500 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/500 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2640 kN C / 5600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-500K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-500K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-500"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-500K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/500K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 670,
    "B_mm": 128,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2640,
    "static_load_kN": 5600,
    "fatigue_load_limit_kN": 460,
    "limiting_speed_rpm": 430,
    "max_rpm": 430,
    "speed_oil_rpm": 560,
    "weight_g": 127000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/500K belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 500×670 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Open by design, 239/500K requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 430 r/min limiting value is .77 of the 560 r/min oil value; heavy 128 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Mount 239/500K on its adapter or withdrawal sleeve on the 500 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 500 mm bore 239/500K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 430 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2640 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 2640 kN rating no longer applies.",
      "The 2640/5600 kN ratings, 460 kN Pu and 127000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/500K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/500K?",
        "a": "239/500K is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 670 mm OD and 128 mm width (19.685 × 26.378 × 5.039 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2640 kN, C0 5600 kN, Pu 460 kN, grease limiting speed 430 r/min, oil 560 r/min, mass about 127000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/500K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/500."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/500K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/500K?",
        "a": "239/500K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/500K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2640 kN C / 5600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-500",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-500 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-500k",
      "239-500K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/500B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 167,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 645,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 226000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/500B is the basic execution of NTN's spherical roller range for a 500 mm shaft — 4250 kN basic dynamic capacity in a 226000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 230/500B is assembled exactly in that order. The 110.0 mm radial section over the 500 mm bore carries two roller rows; capacity per millimetre of bore is about 8.5 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. With about 8.5 kN of C per millimetre of the 500 mm bore, 230/500B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Fit the cylindrical-bore 230/500B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 500 mm bore 230/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/500B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 230/500B and its tapered-bore counterpart 230/500BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 4250/8300 kN ratings, 645 kN Pu and 226000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/500B?",
        "a": "230/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 167 mm width (19.685 × 28.346 × 6.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8300 kN, Pu 645 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 226000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/500BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/500B?",
        "a": "230/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-500BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-500BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-500b",
      "230-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-500BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/500BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 167,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4250,
    "static_load_kN": 8300,
    "fatigue_load_limit_kN": 645,
    "limiting_speed_rpm": 410,
    "max_rpm": 410,
    "speed_oil_rpm": 530,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/500BK belongs to the 23000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 230/500BK is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 218000 g (218.00 kg) for the 500×720×167 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 230/500BK on its adapter or withdrawal sleeve on the 500 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 500 mm bore 230/500BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 167 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 530 r/min needs drain and level design; flooding the 167 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/500BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 4250/8300 kN ratings, 645 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/500BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/500BK?",
        "a": "230/500BK is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 167 mm width (19.685 × 28.346 × 6.575 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4250 kN, C0 8300 kN, Pu 645 kN, grease limiting speed 410 r/min, oil 530 r/min, mass about 218000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/500BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/500BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/500BK?",
        "a": "230/500BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/500BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4250 kN C / 8300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-500bk",
      "230-500BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/500B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5300,
    "static_load_kN": 10900,
    "fatigue_load_limit_kN": 640,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 460,
    "weight_g": 295000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/500B with a cylindrical bore and plain outer ring (no D1/W33 groove): 500 mm bore, 720 mm OD, 218 mm width, rated 350 r/min on grease. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 720 mm OD / 218 mm width follow the general plan. Open by design, 240/500B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Grease/oil ratio: the 350 r/min limiting value is .76 of the 460 r/min oil value; heavy 218 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 500 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 500 mm bore 240/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 218 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/500B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5300 kN rating no longer applies.",
      "The 5300/10900 kN ratings, 640 kN Pu and 295000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/500B?",
        "a": "240/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 218 mm width (19.685 × 28.346 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5300 kN, C0 10900 kN, Pu 640 kN, grease limiting speed 350 r/min, oil 460 r/min, mass about 295000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/500BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/500B?",
        "a": "240/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5300 kN C / 10900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-500BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-500BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-500b",
      "240-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-500BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/500BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 720,
    "B_mm": 218,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5300,
    "static_load_kN": 10900,
    "fatigue_load_limit_kN": 640,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 460,
    "weight_g": 290000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/500BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 500 mm bore, 720 mm OD, 218 mm width, rated 350 r/min on grease. Reading the full code: the number gives the 500×720 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 240/500BK30: the bare number is the standard open execution; K30 marks the 1:30 tapered bore of the wide series; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. The 110.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 218 mm-wide ring seats fully on both sides. Never mount 240/500BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 720 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 500 mm bore 240/500BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 218 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 460 r/min needs drain and level design; flooding the 218 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/500BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 218 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 5300/10900 kN ratings, 640 kN Pu and 290000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/500BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/500BK30?",
        "a": "240/500BK30 is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 720 mm OD and 218 mm width (19.685 × 28.346 × 8.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5300 kN, C0 10900 kN, Pu 640 kN, grease limiting speed 350 r/min, oil 460 r/min, mass about 290000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/500BK30 mounts on a matching adapter or withdrawal sleeve on a plain 500 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/500BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/500BK30?",
        "a": "240/500BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/500BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5300 kN C / 10900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-500bk30",
      "240-500BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/500B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 264,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 13700,
    "fatigue_load_limit_kN": 875,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 584000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/500B is the basic execution of NTN's spherical roller range for a 500 mm shaft — 7700 kN basic dynamic capacity in a 584000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 830 mm OD / 264 mm width follow the general plan. Two symmetric roller rows share the load: C 7700 kN, C0 13700 kN (C0/C ≈ 1.78), with useful axial capacity in either direction alongside the dominant radial load. Pu 875 kN against C0 13700 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/500B moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 500 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 500 mm bore 231/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7700 kN rating no longer applies.",
      "Oil relubrication toward 430 r/min needs drain and level design; flooding the 264 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 264 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 500 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 7700/13700 kN ratings, 875 kN Pu and 584000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/500B?",
        "a": "231/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 264 mm width (19.685 × 32.677 × 10.394 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 13700 kN, Pu 875 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 584000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/500BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/500B?",
        "a": "231/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 13700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-500BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-500BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-500b",
      "231-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-500BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/500BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 264,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7700,
    "static_load_kN": 13700,
    "fatigue_load_limit_kN": 875,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 566000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/500BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 500×830×264 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 830 mm OD / 264 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. 500 mm bore is 19.685 in and 830 mm OD is 32.677 in; the ISO 15 envelope swaps between brands, but the 7700/13700 kN ratings and cage design are NTN 2203E values. Mount 231/500BK on its adapter or withdrawal sleeve on the 500 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 500 mm bore 231/500BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7700 kN rating no longer applies.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/500B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Never substitute 231/500BK by envelope alone: the 13700 kN C0 and 875 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 7700/13700 kN ratings, 875 kN Pu and 566000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/500BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/500BK?",
        "a": "231/500BK is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 264 mm width (19.685 × 32.677 × 10.394 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7700 kN, C0 13700 kN, Pu 875 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 566000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/500BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/500BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/500BK?",
        "a": "231/500BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/500BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7700 kN C / 13700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-500bk",
      "231-500BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/500B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9000,
    "static_load_kN": 16700,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 716000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/500B with a cylindrical bore and plain outer ring (no D1/W33 groove): 500 mm bore, 830 mm OD, 325 mm width, rated 330 r/min on grease. Reading the full code: the number gives the 500×830 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. With about 18.0 kN of C per millimetre of the 500 mm bore, 241/500B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 500 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 500 mm bore 241/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 430 r/min needs drain and level design; flooding the 325 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/500B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/500B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "The 9000/16700 kN ratings, 870 kN Pu and 716000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/500B?",
        "a": "241/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 325 mm width (19.685 × 32.677 × 12.795 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9000 kN, C0 16700 kN, Pu 870 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 716000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/500BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/500B?",
        "a": "241/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9000 kN C / 16700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-500BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-500BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-500b",
      "241-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-500BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/500BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 830,
    "B_mm": 325,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9000,
    "static_load_kN": 16700,
    "fatigue_load_limit_kN": 870,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 705000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 500 mm shaft, NTN supplies 241/500BK30: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 430 r/min. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 500 mm (two-digit code ×5, with the 00–03 exception table), and 830 mm OD / 325 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. The 165.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 325 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/500BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 500 mm bore 241/500BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 330 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 430 r/min needs drain and level design; flooding the 325 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9000 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "The 9000/16700 kN ratings, 870 kN Pu and 705000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/500BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/500BK30?",
        "a": "241/500BK30 is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 830 mm OD and 325 mm width (19.685 × 32.677 × 12.795 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9000 kN, C0 16700 kN, Pu 870 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 705000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/500BK30 mounts on a matching adapter or withdrawal sleeve on a plain 500 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/500BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/500BK30?",
        "a": "241/500BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/500BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9000 kN C / 16700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-500bk30",
      "241-500BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-500B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/500B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 920,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10500,
    "static_load_kN": 17800,
    "fatigue_load_limit_kN": 1100,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 1000000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/500B denotes the 500 mm bore spherical roller bearing (10500 kN C / 17800 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 232/500B is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 1000000 g (1000.00 kg) for the 500×920×336 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 500 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 500 mm bore 232/500B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 400 r/min needs drain and level design; flooding the 336 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 336 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 232/500B and its tapered-bore counterpart 232/500BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/500B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 10500/17800 kN ratings, 1100 kN Pu and 1000000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/500B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/500B?",
        "a": "232/500B is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 920 mm OD and 336 mm width (19.685 × 36.22 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10500 kN, C0 17800 kN, Pu 1100 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 1000000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/500B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/500BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/500B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/500B?",
        "a": "232/500B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/500B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10500 kN C / 17800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-500BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-500BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-500b",
      "232-500B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-500BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/500BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 500,
    "D_mm": 920,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10500,
    "static_load_kN": 17800,
    "fatigue_load_limit_kN": 1100,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 971000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/500BK denotes the 500 mm bore spherical roller bearing (10500 kN C / 17800 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 500×920 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 310 r/min limiting value is .78 of the 400 r/min oil value; heavy 336 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 500 mm set.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 500 mm bore 232/500BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/500BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 500 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/500BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 10500/17800 kN ratings, 1100 kN Pu and 971000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/500BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/500BK?",
        "a": "232/500BK is an NTN double-row spherical roller bearing to ISO 15: 500 mm bore, 920 mm OD and 336 mm width (19.685 × 36.22 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10500 kN, C0 17800 kN, Pu 1100 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 971000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/500BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/500B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/500BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/500BK?",
        "a": "232/500BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/500BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10500 kN C / 17800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-500B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-500B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-500bk",
      "232-500BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-530",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/530",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 710,
    "B_mm": 136,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2940,
    "static_load_kN": 6450,
    "fatigue_load_limit_kN": 400,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 157000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/530 is the basic execution of NTN's spherical roller range for a 530 mm shaft — 2940 kN basic dynamic capacity in a 157000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 239/530 is assembled exactly in that order. The cylindrical bore fits a machined 530 mm shaft seat directly; the same envelope in 239/530K (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 400 kN against C0 6450 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/530 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 136 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 530 mm bore 239/530 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/530 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Never substitute 239/530 by envelope alone: the 6450 kN C0 and 400 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 239/530 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×710 mm envelope is identical.",
      "The 2940/6450 kN ratings, 400 kN Pu and 157000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/530 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/530?",
        "a": "239/530 is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 710 mm OD and 136 mm width (20.866 × 27.953 × 5.354 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2940 kN, C0 6450 kN, Pu 400 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 157000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/530 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/530K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/530 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/530?",
        "a": "239/530 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/530 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2940 kN C / 6450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-530K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-530K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-530"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-530K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/530K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 710,
    "B_mm": 136,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 2940,
    "static_load_kN": 6450,
    "fatigue_load_limit_kN": 400,
    "limiting_speed_rpm": 400,
    "max_rpm": 400,
    "speed_oil_rpm": 520,
    "weight_g": 152000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/530K identifies a 530×710×136 mm (20.866 × 27.953 × 5.354 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 530×710 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 239/530K: the bare number is the standard open execution; K marks the 1:12 tapered bore; quote the full code because each suffix is a distinct article. Grease/oil ratio: the 400 r/min limiting value is .77 of the 520 r/min oil value; heavy 136 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 530 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 239/530K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 239/530K by envelope alone: the 6450 kN C0 and 400 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 136 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 2940/6450 kN ratings, 400 kN Pu and 152000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/530K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/530K?",
        "a": "239/530K is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 710 mm OD and 136 mm width (20.866 × 27.953 × 5.354 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 2940 kN, C0 6450 kN, Pu 400 kN, grease limiting speed 400 r/min, oil 520 r/min, mass about 152000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/530K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/530."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/530K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/530K?",
        "a": "239/530K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/530K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 2940 kN C / 6450 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-530",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-530 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-530k",
      "239-530K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/530B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4850,
    "static_load_kN": 9350,
    "fatigue_load_limit_kN": 710,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 306000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 230/530B with a cylindrical bore and plain outer ring (no D1/W33 groove): 530 mm bore, 780 mm OD, 185 mm width, rated 380 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 230/530B is assembled exactly in that order. Pu 710 kN is the catalogue fatigue load limit for 230/530B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 9.2 kN of C per millimetre of the 530 mm bore, 230/530B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 530 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 530 mm bore 230/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 185 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/530B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 4850/9350 kN ratings, 710 kN Pu and 306000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/530B?",
        "a": "230/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 185 mm width (20.866 × 30.709 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4850 kN, C0 9350 kN, Pu 710 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 306000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/530BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/530B?",
        "a": "230/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4850 kN C / 9350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-530BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-530BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-530b",
      "230-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-530BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/530BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 185,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4850,
    "static_load_kN": 9350,
    "fatigue_load_limit_kN": 710,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 295000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/530BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×780×185 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 780 mm OD / 185 mm width follow the general plan. The 125.0 mm radial section over the 530 mm bore carries two roller rows; capacity per millimetre of bore is about 9.2 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 380 r/min grease limiting speed is the cage/kinematic ceiling and 490 r/min is the oil-lubricated value for the 530 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/530BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 230/530BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 185 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/530BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/530BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/530B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4850/9350 kN ratings, 710 kN Pu and 295000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/530BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/530BK?",
        "a": "230/530BK is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 185 mm width (20.866 × 30.709 × 7.283 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4850 kN, C0 9350 kN, Pu 710 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 295000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/530BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/530BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/530BK?",
        "a": "230/530BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/530BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4850 kN C / 9350 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-530bk",
      "230-530BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/530B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6200,
    "static_load_kN": 12700,
    "fatigue_load_limit_kN": 700,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 413000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/530B is the basic execution of NTN's spherical roller range for a 530 mm shaft — 6200 kN basic dynamic capacity in a 413000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 780 mm OD / 250 mm width follow the general plan. At 6200 kN C and 413000 g mass the 24000 series part is built for shock and vibration; the 250 mm-wide ring needs square abutments to keep both rows equally loaded. 530 mm bore is 20.866 in and 780 mm OD is 30.709 in; the ISO 15 envelope swaps between brands, but the 6200/12700 kN ratings and cage design are NTN 2203E values. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/530B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 240/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 240/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×780 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 240/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×780 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/530B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 330 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 6200/12700 kN ratings, 700 kN Pu and 413000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/530B?",
        "a": "240/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 250 mm width (20.866 × 30.709 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6200 kN, C0 12700 kN, Pu 700 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 413000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/530BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/530B?",
        "a": "240/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6200 kN C / 12700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-530BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-530BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-530b",
      "240-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-530BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/530BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 780,
    "B_mm": 250,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6200,
    "static_load_kN": 12700,
    "fatigue_load_limit_kN": 700,
    "limiting_speed_rpm": 330,
    "max_rpm": 330,
    "speed_oil_rpm": 430,
    "weight_g": 406000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/530BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×780×250 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 780 mm OD / 250 mm width follow the general plan. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Equivalent-load planning keeps a radial plus moderate axial combination on 240/530BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Mount 240/530BK30 on its adapter or withdrawal sleeve on the 530 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 530 mm bore 240/530BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 330 r/min grease rating is lost to abrasive wear long before fatigue.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "The 6200/12700 kN ratings, 700 kN Pu and 406000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/530BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/530BK30?",
        "a": "240/530BK30 is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 780 mm OD and 250 mm width (20.866 × 30.709 × 9.843 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6200 kN, C0 12700 kN, Pu 700 kN, grease limiting speed 330 r/min, oil 430 r/min, mass about 406000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/530BK30 mounts on a matching adapter or withdrawal sleeve on a plain 530 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/530BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/530BK30?",
        "a": "240/530BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/530BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6200 kN C / 12700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-530bk30",
      "240-530BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/530B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7800,
    "static_load_kN": 14200,
    "fatigue_load_limit_kN": 920,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 653000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 231/530B with a cylindrical bore and plain outer ring (no D1/W33 groove): 530 mm bore, 870 mm OD, 272 mm width, rated 310 r/min on grease. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 530 mm (two-digit code ×5, with the 00–03 exception table), and 870 mm OD / 272 mm width follow the general plan. The cylindrical bore fits a machined 530 mm shaft seat directly; the same envelope in 231/530BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Pu 920 kN against C0 14200 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/530B moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 530 mm bore 231/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 272 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The cylindrical-bore 231/530B and its tapered-bore counterpart 231/530BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 231/530B and its tapered-bore counterpart 231/530BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 231/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×870 mm envelope is identical.",
      "The 7800/14200 kN ratings, 920 kN Pu and 653000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/530B?",
        "a": "231/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 272 mm width (20.866 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7800 kN, C0 14200 kN, Pu 920 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 653000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/530BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/530B?",
        "a": "231/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7800 kN C / 14200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-530BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-530BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-530b",
      "231-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-530BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/530BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7800,
    "static_load_kN": 14200,
    "fatigue_load_limit_kN": 920,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 633000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/530BK denotes the 530 mm bore spherical roller bearing (7800 kN C / 14200 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 530×870 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Catalogue mass 633000 g (633.00 kg) for the 530×870×272 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 231/530BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 530 mm bore 231/530BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/530BK by envelope alone: the 14200 kN C0 and 920 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 231/530BK by envelope alone: the 14200 kN C0 and 920 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7800 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/530BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 7800/14200 kN ratings, 920 kN Pu and 633000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/530BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/530BK?",
        "a": "231/530BK is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 272 mm width (20.866 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7800 kN, C0 14200 kN, Pu 920 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 633000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/530BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/530BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/530BK?",
        "a": "231/530BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/530BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7800 kN C / 14200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-530bk",
      "231-530BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/530B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9250,
    "static_load_kN": 17400,
    "fatigue_load_limit_kN": 910,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 241/530B denotes the 530 mm bore spherical roller bearing (9250 kN C / 17400 kN C0) in the 24100 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 241/530B is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Grease/oil ratio: the 310 r/min limiting value is .78 of the 400 r/min oil value; heavy 335 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/530B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 530 mm bore 241/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 335 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 241/530B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 530×870 mm envelope is identical.",
      "Never substitute 241/530B by envelope alone: the 17400 kN C0 and 910 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 9250/17400 kN ratings, 910 kN Pu and 800000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/530B?",
        "a": "241/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 335 mm width (20.866 × 34.252 × 13.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9250 kN, C0 17400 kN, Pu 910 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 800000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/530BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/530B?",
        "a": "241/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9250 kN C / 17400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-530BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-530BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-530b",
      "241-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-530BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/530BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 870,
    "B_mm": 335,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9250,
    "static_load_kN": 17400,
    "fatigue_load_limit_kN": 910,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 788000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/530BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 530 mm bore, 870 mm OD, 335 mm width, rated 310 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K30), lubrication feature (none); 241/530BK30 is assembled exactly in that order. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Equivalent-load planning keeps a radial plus moderate axial combination on 241/530BK30; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 335 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 530 mm bore 241/530BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/530BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 530 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 335 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/530BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 9250/17400 kN ratings, 910 kN Pu and 788000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/530BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/530BK30?",
        "a": "241/530BK30 is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 870 mm OD and 335 mm width (20.866 × 34.252 × 13.189 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9250 kN, C0 17400 kN, Pu 910 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 788000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/530BK30 mounts on a matching adapter or withdrawal sleeve on a plain 530 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/530BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/530BK30?",
        "a": "241/530BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/530BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9250 kN C / 17400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-530bk30",
      "241-530BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-530B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/530B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 980,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11500,
    "static_load_kN": 19800,
    "fatigue_load_limit_kN": 1210,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 1200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/530B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×980×355 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 232/530B is assembled exactly in that order. At 11500 kN C and 1200000 g mass the 23200 series part is built for shock and vibration; the 355 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 1210 kN against C0 19800 kN anchors the contamination derating; for dirty mining duty the adjusted life of 232/530B moves with cleanliness far more than with small C variations. Never mount 232/530B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 980 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 530 mm bore 232/530B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 530 mm bearing, and drive-up procedures differ.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/530B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 232/530B by envelope alone: the 19800 kN C0 and 1210 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 11500/19800 kN ratings, 1210 kN Pu and 1200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/530B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/530B?",
        "a": "232/530B is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 980 mm OD and 355 mm width (20.866 × 38.583 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11500 kN, C0 19800 kN, Pu 1210 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 1200000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/530B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/530BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/530B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/530B?",
        "a": "232/530B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/530B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11500 kN C / 19800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-530BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-530BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-530b",
      "232-530B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-530BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/530BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 530,
    "D_mm": 980,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11500,
    "static_load_kN": 19800,
    "fatigue_load_limit_kN": 1210,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 1170000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/530BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 530×980×355 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 232/530BK to its envelope and execution: same-number EA versus EM or plain variants share the 530 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 232/530BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. With about 21.7 kN of C per millimetre of the 530 mm bore, 232/530BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Mount 232/530BK on its adapter or withdrawal sleeve on the 530 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 530 mm bore 232/530BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 232/530B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/530BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 355 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 11500/19800 kN ratings, 1210 kN Pu and 1170000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/530BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/530BK?",
        "a": "232/530BK is an NTN double-row spherical roller bearing to ISO 15: 530 mm bore, 980 mm OD and 355 mm width (20.866 × 38.583 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11500 kN, C0 19800 kN, Pu 1210 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 1170000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/530BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/530B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/530BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/530BK?",
        "a": "232/530BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/530BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11500 kN C / 19800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-530B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-530B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-530bk",
      "232-530BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-560",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/560",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3200,
    "static_load_kN": 6900,
    "fatigue_load_limit_kN": 525,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 182000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/560 identifies a 560×750×140 mm (22.047 × 29.528 × 5.512 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Digit by digit the code reads as spherical-roller dimension series plus 560 mm bore; the 140 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 239/560: 380 r/min grease and 490 r/min oil — the gap of 110 r/min reflects oil cooling of the heavy roller set. 560 mm bore is 22.047 in and 750 mm OD is 29.528 in; the ISO 15 envelope swaps between brands, but the 3200/6900 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 560 mm bore 239/560 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 3200 kN rating no longer applies.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/560 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 490 r/min needs drain and level design; flooding the 140 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 3200/6900 kN ratings, 525 kN Pu and 182000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/560 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/560?",
        "a": "239/560 is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 750 mm OD and 140 mm width (22.047 × 29.528 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3200 kN, C0 6900 kN, Pu 525 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 182000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/560 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/560K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/560 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/560?",
        "a": "239/560 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/560 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3200 kN C / 6900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-560K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-560K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-560"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-560K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/560K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 750,
    "B_mm": 140,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3200,
    "static_load_kN": 6900,
    "fatigue_load_limit_kN": 525,
    "limiting_speed_rpm": 380,
    "max_rpm": 380,
    "speed_oil_rpm": 490,
    "weight_g": 176000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 560 mm shaft, NTN supplies 239/560K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 490 r/min. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 239/560K is assembled exactly in that order. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Equivalent-load planning keeps a radial plus moderate axial combination on 239/560K; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 140 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 560 mm bore 239/560K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 380 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 140 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 239/560K by envelope alone: the 6900 kN C0 and 525 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 3200/6900 kN ratings, 525 kN Pu and 176000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/560K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/560K?",
        "a": "239/560K is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 750 mm OD and 140 mm width (22.047 × 29.528 × 5.512 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3200 kN, C0 6900 kN, Pu 525 kN, grease limiting speed 380 r/min, oil 490 r/min, mass about 176000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/560K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/560."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/560K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/560K?",
        "a": "239/560K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/560K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3200 kN C / 6900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-560",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-560 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-560k",
      "239-560K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/560B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 800,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 353000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/560B denotes the 560 mm bore spherical roller bearing (5350 kN C / 10500 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 230/560B is assembled exactly in that order. The cylindrical bore fits a machined 560 mm shaft seat directly; the same envelope in 230/560BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Catalogue mass 353000 g (353.00 kg) for the 560×820×195 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 195 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 560 mm bore 230/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The cylindrical-bore 230/560B and its tapered-bore counterpart 230/560BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 230/560B and its tapered-bore counterpart 230/560BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 230/560B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 560×820 mm envelope is identical.",
      "The 5350/10500 kN ratings, 800 kN Pu and 353000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/560B?",
        "a": "230/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 195 mm width (22.047 × 32.283 × 7.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 10500 kN, Pu 800 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 353000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/560BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/560B?",
        "a": "230/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-560BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-560BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-560b",
      "230-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-560BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/560BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 195,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5350,
    "static_load_kN": 10500,
    "fatigue_load_limit_kN": 800,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 340000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/560BK denotes the 560 mm bore spherical roller bearing (5350 kN C / 10500 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 560×820 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 800 kN is the catalogue fatigue load limit for 230/560BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 130.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 195 mm-wide ring seats fully on both sides. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 560 mm bore 230/560BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5350 kN rating no longer applies.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 195 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/560BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5350/10500 kN ratings, 800 kN Pu and 340000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/560BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/560BK?",
        "a": "230/560BK is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 195 mm width (22.047 × 32.283 × 7.677 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5350 kN, C0 10500 kN, Pu 800 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 340000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/560BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/560BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/560BK?",
        "a": "230/560BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/560BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5350 kN C / 10500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-560bk",
      "230-560BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/560B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6750,
    "static_load_kN": 14100,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 467000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/560B with a cylindrical bore and plain outer ring (no D1/W33 groove): 560 mm bore, 820 mm OD, 258 mm width, rated 310 r/min on grease. The leading digits are the ISO 15 dimension series (24000 series); the bore code resolves to 560 mm (two-digit code ×5, with the 00–03 exception table), and 820 mm OD / 258 mm width follow the general plan. Two symmetric roller rows share the load: C 6750 kN, C0 14100 kN (C0/C ≈ 2.09), with useful axial capacity in either direction alongside the dominant radial load. 560 mm bore is 22.047 in and 820 mm OD is 32.283 in; the ISO 15 envelope swaps between brands, but the 6750/14100 kN ratings and cage design are NTN 2203E values. Fillet radii on shaft and housing must clear the ring chamfers of the 258 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 560 mm bore 240/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6750 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 240/560B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 560×820 mm envelope is identical.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 6750/14100 kN ratings, 750 kN Pu and 467000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/560B?",
        "a": "240/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 258 mm width (22.047 × 32.283 × 10.157 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6750 kN, C0 14100 kN, Pu 750 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 467000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/560BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/560B?",
        "a": "240/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6750 kN C / 14100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-560BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-560BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-560b",
      "240-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-560BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/560BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 820,
    "B_mm": 258,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6750,
    "static_load_kN": 14100,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 459000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 240/560BK30 identifies a 560×820×258 mm (22.047 × 32.283 × 10.157 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Reading the full code: the number gives the 560×820 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. With about 12.1 kN of C per millimetre of the 560 mm bore, 240/560BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 560 mm set.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 560 mm bore 240/560BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/560BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 240/560BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 6750/14100 kN ratings, 750 kN Pu and 459000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/560BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/560BK30?",
        "a": "240/560BK30 is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 820 mm OD and 258 mm width (22.047 × 32.283 × 10.157 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6750 kN, C0 14100 kN, Pu 750 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 459000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/560BK30 mounts on a matching adapter or withdrawal sleeve on a plain 560 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/560BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/560BK30?",
        "a": "240/560BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/560BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6750 kN C / 14100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-560bk30",
      "240-560BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/560B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8550,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 752000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/560B denotes the 560 mm bore spherical roller bearing (8550 kN C / 15500 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 560 mm bore; the 280 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 231/560B: 280 r/min grease and 370 r/min oil — the gap of 90 r/min reflects oil cooling of the heavy roller set. Catalogue mass 752000 g (752.00 kg) for the 560×920×280 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fit the cylindrical-bore 231/560B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 560 mm bore 231/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 8550 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 231/560B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 560×920 mm envelope is identical.",
      "Never substitute 231/560B by envelope alone: the 15500 kN C0 and 1000 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 280 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 8550/15500 kN ratings, 1000 kN Pu and 752000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/560B?",
        "a": "231/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 280 mm width (22.047 × 36.22 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8550 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 752000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/560BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/560B?",
        "a": "231/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8550 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-560BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-560BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-560b",
      "231-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-560BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/560BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 280,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8550,
    "static_load_kN": 15500,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 729000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 231/560BK with a 1:12 tapered bore (K) and plain outer ring (no D1/W33 groove): 560 mm bore, 920 mm OD, 280 mm width, rated 280 r/min on grease. Numbering ties 231/560BK to its envelope and execution: same-number EA versus EM or plain variants share the 560 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 180.0 mm radial section over the 560 mm bore carries two roller rows; capacity per millimetre of bore is about 15.3 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Speed planning: 280 r/min grease limiting speed is the cage/kinematic ceiling and 370 r/min is the oil-lubricated value for the 560 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 560 mm bore 231/560BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/560BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/560BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/560B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 8550/15500 kN ratings, 1000 kN Pu and 729000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/560BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/560BK?",
        "a": "231/560BK is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 280 mm width (22.047 × 36.22 × 11.024 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8550 kN, C0 15500 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 729000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/560BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/560BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/560BK?",
        "a": "231/560BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/560BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8550 kN C / 15500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-560bk",
      "231-560BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/560B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11100,
    "static_load_kN": 20800,
    "fatigue_load_limit_kN": 1030,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 948000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/560B with a cylindrical bore and plain outer ring (no D1/W33 groove): 560 mm bore, 920 mm OD, 355 mm width, rated 280 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 241/560B is assembled exactly in that order. Suffix reading on 241/560B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. 560 mm bore is 22.047 in and 920 mm OD is 36.22 in; the ISO 15 envelope swaps between brands, but the 11100/20800 kN ratings and cage design are NTN 2203E values. Fit the cylindrical-bore 241/560B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 560 mm bore 241/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 355 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/560B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 280 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 355 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 11100/20800 kN ratings, 1030 kN Pu and 948000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/560B?",
        "a": "241/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 355 mm width (22.047 × 36.22 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11100 kN, C0 20800 kN, Pu 1030 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 948000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/560BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/560B?",
        "a": "241/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11100 kN C / 20800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-560BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-560BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-560b",
      "241-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-560BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/560BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 920,
    "B_mm": 355,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11100,
    "static_load_kN": 20800,
    "fatigue_load_limit_kN": 1030,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 934000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/560BK30 is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 560×920×355 mm to ISO 15, with pressed-steel cage (standard execution). The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 560 mm (two-digit code ×5, with the 00–03 exception table), and 920 mm OD / 355 mm width follow the general plan. Pu 1030 kN is the catalogue fatigue load limit for 241/560BK30, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 19.8 kN of C per millimetre of the 560 mm bore, 241/560BK30 screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 560 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 560 mm bore 241/560BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 241/560BK30 by envelope alone: the 20800 kN C0 and 1030 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/560BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 355 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/560BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 11100/20800 kN ratings, 1030 kN Pu and 934000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/560BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/560BK30?",
        "a": "241/560BK30 is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 920 mm OD and 355 mm width (22.047 × 36.22 × 13.976 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11100 kN, C0 20800 kN, Pu 1030 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 934000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/560BK30 mounts on a matching adapter or withdrawal sleeve on a plain 560 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/560BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/560BK30?",
        "a": "241/560BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/560BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11100 kN C / 20800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-560bk30",
      "241-560BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-560B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/560B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 1030,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12300,
    "static_load_kN": 21100,
    "fatigue_load_limit_kN": 1320,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1360000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/560B denotes the 560 mm bore spherical roller bearing (12300 kN C / 21100 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 232/560B is assembled exactly in that order. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Pu 1320 kN against C0 21100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 232/560B moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 365 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 560 mm bore 232/560B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 232/560B by envelope alone: the 21100 kN C0 and 1320 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 560 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 560 mm bearing, and drive-up procedures differ.",
      "The 12300/21100 kN ratings, 1320 kN Pu and 1360000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/560B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/560B?",
        "a": "232/560B is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 1030 mm OD and 365 mm width (22.047 × 40.551 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12300 kN, C0 21100 kN, Pu 1320 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1360000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/560B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/560BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/560B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/560B?",
        "a": "232/560B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/560B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12300 kN C / 21100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-560BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-560BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-560b",
      "232-560B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-560BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/560BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 560,
    "D_mm": 1030,
    "B_mm": 365,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12300,
    "static_load_kN": 21100,
    "fatigue_load_limit_kN": 1320,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1320000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/560BK denotes the 560 mm bore spherical roller bearing (12300 kN C / 21100 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 560 mm bore; the 365 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 232/560BK: 260 r/min grease and 340 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. Pu 1320 kN against C0 21100 kN anchors the contamination derating; for dirty mining duty the adjusted life of 232/560BK moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 232/560BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 560 mm bore 232/560BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/560BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 12300 kN rating no longer applies.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 365 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 365 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 12300/21100 kN ratings, 1320 kN Pu and 1320000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/560BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/560BK?",
        "a": "232/560BK is an NTN double-row spherical roller bearing to ISO 15: 560 mm bore, 1030 mm OD and 365 mm width (22.047 × 40.551 × 14.37 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12300 kN, C0 21100 kN, Pu 1320 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1320000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/560BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/560B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/560BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/560BK?",
        "a": "232/560BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/560BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12300 kN C / 21100 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-560B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-560B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-560bk",
      "232-560BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-600",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/600",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 800,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3600,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 218000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/600 is the basic execution of NTN's spherical roller range for a 600 mm shaft — 3600 kN basic dynamic capacity in a 218000 g, open ISO 15 envelope. Reading the full code: the number gives the 600×800 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 490 kN against C0 8000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/600 moves with cleanliness far more than with small C variations. Fillet radii on shaft and housing must clear the ring chamfers of the 150 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 600 mm bore 239/600 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 450 r/min needs drain and level design; flooding the 150 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 450 r/min needs drain and level design; flooding the 150 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/600 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 3600/8000 kN ratings, 490 kN Pu and 218000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/600 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/600?",
        "a": "239/600 is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 800 mm OD and 150 mm width (23.622 × 31.496 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3600 kN, C0 8000 kN, Pu 490 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 218000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/600 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/600K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/600 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/600?",
        "a": "239/600 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/600 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3600 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-600K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-600K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-600"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-600K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/600K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 800,
    "B_mm": 150,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 3600,
    "static_load_kN": 8000,
    "fatigue_load_limit_kN": 490,
    "limiting_speed_rpm": 350,
    "max_rpm": 350,
    "speed_oil_rpm": 450,
    "weight_g": 211000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 600 mm shaft, NTN supplies 239/600K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 450 r/min. Digit by digit the code reads as spherical-roller dimension series plus 600 mm bore; the 150 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 1:12 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 600 mm bore assembly. Selection: the C0/C ratio of 2.22 (8000/3600 kN) reflects the heavy static and shock proportioning of 239/600K; size the equivalent load at the required L10 with shock factor for the application. Mount 239/600K on its adapter or withdrawal sleeve on the 600 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 239/600K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 150 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/600K on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 350 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Do not confuse EA and EM at the same number: 239/600K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×800 mm envelope is identical.",
      "The 3600/8000 kN ratings, 490 kN Pu and 211000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/600K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/600K?",
        "a": "239/600K is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 800 mm OD and 150 mm width (23.622 × 31.496 × 5.906 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 3600 kN, C0 8000 kN, Pu 490 kN, grease limiting speed 350 r/min, oil 450 r/min, mass about 211000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/600K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/600."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/600K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/600K?",
        "a": "239/600K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/600K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 3600 kN C / 8000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-600",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-600 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-600k",
      "239-600K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/600B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 835,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 420,
    "weight_g": 400000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/600B denotes the 600 mm bore spherical roller bearing (5800 kN C / 12000 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 600×870 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Pu 835 kN is the catalogue fatigue load limit for 230/600B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Grease/oil ratio: the 310 r/min limiting value is .74 of the 420 r/min oil value; heavy 200 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 600 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 600 mm bore 230/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "The cylindrical-bore 230/600B and its tapered-bore counterpart 230/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/600B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 5800/12000 kN ratings, 835 kN Pu and 400000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/600B?",
        "a": "230/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 200 mm width (23.622 × 34.252 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 12000 kN, Pu 835 kN, grease limiting speed 310 r/min, oil 420 r/min, mass about 400000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/600BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/600B?",
        "a": "230/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-600BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-600BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-600b",
      "230-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-600BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/600BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 200,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 5800,
    "static_load_kN": 12000,
    "fatigue_load_limit_kN": 835,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 420,
    "weight_g": 386000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/600BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×870×200 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 230/600BK to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 230/600BK requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Pu 835 kN against C0 12000 kN anchors the contamination derating; for dirty mining duty the adjusted life of 230/600BK moves with cleanliness far more than with small C variations. Mount 230/600BK on its adapter or withdrawal sleeve on the 600 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 600 mm bore 230/600BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 230/600BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×870 mm envelope is identical.",
      "Never substitute 230/600BK by envelope alone: the 12000 kN C0 and 835 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 200 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 5800 kN rating no longer applies.",
      "The 5800/12000 kN ratings, 835 kN Pu and 386000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/600BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/600BK?",
        "a": "230/600BK is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 200 mm width (23.622 × 34.252 × 7.874 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 5800 kN, C0 12000 kN, Pu 835 kN, grease limiting speed 310 r/min, oil 420 r/min, mass about 386000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/600BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/600BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/600BK?",
        "a": "230/600BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/600BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 5800 kN C / 12000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-600bk",
      "230-600BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/600B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7150,
    "static_load_kN": 15600,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 544000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/600B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×870×272 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 240/600B to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 240/600B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. The 135.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 272 mm-wide ring seats fully on both sides. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 240/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 272 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 240/600B and its tapered-bore counterpart 240/600BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 240/600B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×870 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 272 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 7150/15600 kN ratings, 750 kN Pu and 544000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/600B?",
        "a": "240/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 272 mm width (23.622 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7150 kN, C0 15600 kN, Pu 750 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 544000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/600BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/600B?",
        "a": "240/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7150 kN C / 15600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-600BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-600BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-600b",
      "240-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-600BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/600BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 870,
    "B_mm": 272,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7150,
    "static_load_kN": 15600,
    "fatigue_load_limit_kN": 750,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 535000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/600BK30 is the basic execution of NTN's spherical roller range for a 600 mm shaft — 7150 kN basic dynamic capacity in a 535000 g, open ISO 15 envelope. Numbering ties 240/600BK30 to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 240/600BK30 requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. Speed planning: 280 r/min grease limiting speed is the cage/kinematic ceiling and 370 r/min is the oil-lubricated value for the 600 mm bore; vibrating screens rarely approach either and are load/cage limited instead. Never mount 240/600BK30 by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 870 mm race.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 600 mm bore 240/600BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "Do not confuse EA and EM at the same number: 240/600BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×870 mm envelope is identical.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7150 kN rating no longer applies.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 7150 kN rating no longer applies.",
      "The 7150/15600 kN ratings, 750 kN Pu and 535000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/600BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/600BK30?",
        "a": "240/600BK30 is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 870 mm OD and 272 mm width (23.622 × 34.252 × 10.709 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7150 kN, C0 15600 kN, Pu 750 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 535000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/600BK30 mounts on a matching adapter or withdrawal sleeve on a plain 600 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/600BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/600BK30?",
        "a": "240/600BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/600BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7150 kN C / 15600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-600bk30",
      "240-600BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/600B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10000,
    "static_load_kN": 18400,
    "fatigue_load_limit_kN": 1160,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 908000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/600B belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 231/600B to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. 600 mm bore is 23.622 in and 980 mm OD is 38.583 in; the ISO 15 envelope swaps between brands, but the 10000/18400 kN ratings and cage design are NTN 2203E values. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 600 mm set.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 231/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/600B by envelope alone: the 18400 kN C0 and 1160 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 300 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10000 kN rating no longer applies.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 600 mm bearing, and drive-up procedures differ.",
      "The 10000/18400 kN ratings, 1160 kN Pu and 908000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/600B?",
        "a": "231/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 300 mm width (23.622 × 38.583 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10000 kN, C0 18400 kN, Pu 1160 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 908000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/600BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/600B?",
        "a": "231/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10000 kN C / 18400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-600BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-600BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-600b",
      "231-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-600BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/600BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 300,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10000,
    "static_load_kN": 18400,
    "fatigue_load_limit_kN": 1160,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 880000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/600BK belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 600 mm bore; the 300 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 1160 kN is the catalogue fatigue load limit for 231/600BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 880000 g (880.00 kg) for the 600×980×300 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 231/600BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 300 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/600BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 600 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/600BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 10000/18400 kN ratings, 1160 kN Pu and 880000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/600BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/600BK?",
        "a": "231/600BK is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 300 mm width (23.622 × 38.583 × 11.811 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10000 kN, C0 18400 kN, Pu 1160 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 880000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/600BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/600BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/600BK?",
        "a": "231/600BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/600BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10000 kN C / 18400 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-600bk",
      "231-600BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/600B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11900,
    "static_load_kN": 23200,
    "fatigue_load_limit_kN": 1130,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1130000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/600B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×980×375 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 600 mm bore; the 375 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Grease/oil ratio: the 260 r/min limiting value is .76 of the 340 r/min oil value; heavy 375 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/600B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 600 mm bore 241/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 241/600B and its tapered-bore counterpart 241/600BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Do not confuse EA and EM at the same number: 241/600B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×980 mm envelope is identical.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 260 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Never substitute 241/600B by envelope alone: the 23200 kN C0 and 1130 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 11900/23200 kN ratings, 1130 kN Pu and 1130000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/600B?",
        "a": "241/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 375 mm width (23.622 × 38.583 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11900 kN, C0 23200 kN, Pu 1130 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1130000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/600BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/600B?",
        "a": "241/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11900 kN C / 23200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-600BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-600BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-600b",
      "241-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-600BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/600BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 980,
    "B_mm": 375,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 11900,
    "static_load_kN": 23200,
    "fatigue_load_limit_kN": 1130,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 1110000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 241/600BK30 identifies a 600×980×375 mm (23.622 × 38.583 × 14.764 in) spherical roller bearing, 1:30 tapered bore (K30), to the ISO 15 boundary plan. Reading the full code: the number gives the 600×980 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. NTN prints two speeds for 241/600BK30: 260 r/min grease and 340 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. Speed planning: 260 r/min grease limiting speed is the cage/kinematic ceiling and 340 r/min is the oil-lubricated value for the 600 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 241/600BK30 leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 600 mm bore 241/600BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 241/600BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×980 mm envelope is identical.",
      "Do not confuse EA and EM at the same number: 241/600BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 600×980 mm envelope is identical.",
      "Never substitute 241/600BK30 by envelope alone: the 23200 kN C0 and 1130 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 375 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 11900/23200 kN ratings, 1130 kN Pu and 1110000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/600BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/600BK30?",
        "a": "241/600BK30 is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 980 mm OD and 375 mm width (23.622 × 38.583 × 14.764 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 11900 kN, C0 23200 kN, Pu 1130 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 1110000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/600BK30 mounts on a matching adapter or withdrawal sleeve on a plain 600 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/600BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/600BK30?",
        "a": "241/600BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/600BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 11900 kN C / 23200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-600bk30",
      "241-600BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-600B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/600B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 1090,
    "B_mm": 388,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13600,
    "static_load_kN": 23700,
    "fatigue_load_limit_kN": 930,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1540000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/600B belongs to the 23200 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 600×1090 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The 245.0 mm radial section over the 600 mm bore carries two roller rows; capacity per millimetre of bore is about 22.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. 600 mm bore is 23.622 in and 1090 mm OD is 42.913 in; the ISO 15 envelope swaps between brands, but the 13600/23700 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 600 mm bore 232/600B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 232/600B and its tapered-bore counterpart 232/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 232/600B and its tapered-bore counterpart 232/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 600 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The cylindrical-bore 232/600B and its tapered-bore counterpart 232/600BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 13600/23700 kN ratings, 930 kN Pu and 1540000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/600B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/600B?",
        "a": "232/600B is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 1090 mm OD and 388 mm width (23.622 × 42.913 × 15.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13600 kN, C0 23700 kN, Pu 930 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1540000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/600B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/600BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/600B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/600B?",
        "a": "232/600B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/600B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13600 kN C / 23700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-600BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-600BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-600b",
      "232-600B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-600BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/600BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 600,
    "D_mm": 1090,
    "B_mm": 388,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13600,
    "static_load_kN": 23700,
    "fatigue_load_limit_kN": 930,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1490000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/600BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 600×1090×388 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 232/600BK to its envelope and execution: same-number EA versus EM or plain variants share the 600 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The 245.0 mm radial section over the 600 mm bore carries two roller rows; capacity per millimetre of bore is about 22.7 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Equivalent-load planning keeps a radial plus moderate axial combination on 232/600BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 600 mm bore 232/600BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 388 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 232/600BK by envelope alone: the 23700 kN C0 and 930 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 388 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 232/600B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 13600/23700 kN ratings, 930 kN Pu and 1490000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/600BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/600BK?",
        "a": "232/600BK is an NTN double-row spherical roller bearing to ISO 15: 600 mm bore, 1090 mm OD and 388 mm width (23.622 × 42.913 × 15.276 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13600 kN, C0 23700 kN, Pu 930 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1490000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/600BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/600B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/600BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/600BK?",
        "a": "232/600BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/600BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13600 kN C / 23700 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-600B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-600B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-600bk",
      "232-600BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-630",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/630",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4100,
    "static_load_kN": 9250,
    "fatigue_load_limit_kN": 545,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 277000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 239/630 identifies a 630×850×165 mm (24.803 × 33.465 × 6.496 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Numbering ties 239/630 to its envelope and execution: same-number EA versus EM or plain variants share the 630 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 4100 kN C and 277000 g mass the 23900 series part is built for shock and vibration; the 165 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 277000 g (277.00 kg) for the 630×850×165 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 630 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 630 mm bore 239/630 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 165 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 320 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 4100/9250 kN ratings, 545 kN Pu and 277000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/630 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/630?",
        "a": "239/630 is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 850 mm OD and 165 mm width (24.803 × 33.465 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4100 kN, C0 9250 kN, Pu 545 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 277000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/630 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/630K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/630 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/630?",
        "a": "239/630 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/630 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4100 kN C / 9250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-630K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-630K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-630"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-630K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/630K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 850,
    "B_mm": 165,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4100,
    "static_load_kN": 9250,
    "fatigue_load_limit_kN": 545,
    "limiting_speed_rpm": 320,
    "max_rpm": 320,
    "speed_oil_rpm": 420,
    "weight_g": 268000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/630K is the basic execution of NTN's spherical roller range for a 630 mm shaft — 4100 kN basic dynamic capacity in a 268000 g, open ISO 15 envelope. Digit by digit the code reads as spherical-roller dimension series plus 630 mm bore; the 165 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. NTN prints two speeds for 239/630K: 320 r/min grease and 420 r/min oil — the gap of 100 r/min reflects oil cooling of the heavy roller set. The 110.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 165 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 239/630K leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 630 mm bore 239/630K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 165 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 630 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/630: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 420 r/min needs drain and level design; flooding the 165 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 4100/9250 kN ratings, 545 kN Pu and 268000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/630K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/630K?",
        "a": "239/630K is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 850 mm OD and 165 mm width (24.803 × 33.465 × 6.496 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4100 kN, C0 9250 kN, Pu 545 kN, grease limiting speed 320 r/min, oil 420 r/min, mass about 268000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/630K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/630."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/630K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/630K?",
        "a": "239/630K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/630K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4100 kN C / 9250 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-630",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-630 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-630k",
      "239-630K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/630B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6550,
    "static_load_kN": 13000,
    "fatigue_load_limit_kN": 950,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 481000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/630B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 630×920×212 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 630×920 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. At 6550 kN C and 481000 g mass the 23000 series part is built for shock and vibration; the 212 mm-wide ring needs square abutments to keep both rows equally loaded. Grease/oil ratio: the 310 r/min limiting value is .78 of the 400 r/min oil value; heavy 212 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/630B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 630 mm bore 230/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 212 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 230/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6550 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 6550/13000 kN ratings, 950 kN Pu and 481000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/630B?",
        "a": "230/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 212 mm width (24.803 × 36.22 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6550 kN, C0 13000 kN, Pu 950 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 481000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/630BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/630B?",
        "a": "230/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6550 kN C / 13000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-630BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-630BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-630b",
      "230-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-630BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/630BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 212,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 6550,
    "static_load_kN": 13000,
    "fatigue_load_limit_kN": 950,
    "limiting_speed_rpm": 310,
    "max_rpm": 310,
    "speed_oil_rpm": 400,
    "weight_g": 464000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/630BK denotes the 630 mm bore spherical roller bearing (6550 kN C / 13000 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 630 mm bore; the 212 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Suffix reading on 230/630BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 1.98 (13000/6550 kN) reflects the heavy static and shock proportioning of 230/630BK; size the equivalent load at the required L10 with shock factor for the application. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/630BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 630 mm bore 230/630BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 6550 kN rating no longer applies.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 310 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 212 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 6550/13000 kN ratings, 950 kN Pu and 464000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/630BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/630BK?",
        "a": "230/630BK is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 212 mm width (24.803 × 36.22 × 8.346 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 6550 kN, C0 13000 kN, Pu 950 kN, grease limiting speed 310 r/min, oil 400 r/min, mass about 464000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/630BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/630BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/630BK?",
        "a": "230/630BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/630BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 6550 kN C / 13000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-630bk",
      "230-630BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/630B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 290,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8400,
    "static_load_kN": 17900,
    "fatigue_load_limit_kN": 915,
    "limiting_speed_rpm": 270,
    "max_rpm": 270,
    "speed_oil_rpm": 350,
    "weight_g": 657000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/630B denotes the 630 mm bore spherical roller bearing (8400 kN C / 17900 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Numbering ties 240/630B to its envelope and execution: same-number EA versus EM or plain variants share the 630 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 915 kN is the catalogue fatigue load limit for 240/630B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. The 145.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 290 mm-wide ring seats fully on both sides. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/630B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 630 mm bore 240/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 630 mm bearing, and drive-up procedures differ.",
      "Never substitute 240/630B by envelope alone: the 17900 kN C0 and 915 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 240/630B by envelope alone: the 17900 kN C0 and 915 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 8400/17900 kN ratings, 915 kN Pu and 657000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/630B?",
        "a": "240/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 290 mm width (24.803 × 36.22 × 11.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8400 kN, C0 17900 kN, Pu 915 kN, grease limiting speed 270 r/min, oil 350 r/min, mass about 657000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/630BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/630B?",
        "a": "240/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8400 kN C / 17900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-630BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-630BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-630b",
      "240-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-630BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/630BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 920,
    "B_mm": 290,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8400,
    "static_load_kN": 17900,
    "fatigue_load_limit_kN": 915,
    "limiting_speed_rpm": 270,
    "max_rpm": 270,
    "speed_oil_rpm": 350,
    "weight_g": 646000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 240/630BK30 denotes the 630 mm bore spherical roller bearing (8400 kN C / 17900 kN C0) in the 24000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 630×920 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. NTN prints two speeds for 240/630BK30: 270 r/min grease and 350 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. Selection: the C0/C ratio of 2.13 (17900/8400 kN) reflects the heavy static and shock proportioning of 240/630BK30; size the equivalent load at the required L10 with shock factor for the application. Mount 240/630BK30 on its adapter or withdrawal sleeve on the 630 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 630 mm bore 240/630BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 8400 kN rating no longer applies.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 290 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 350 r/min needs drain and level design; flooding the 290 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 8400/17900 kN ratings, 915 kN Pu and 646000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/630BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/630BK30?",
        "a": "240/630BK30 is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 920 mm OD and 290 mm width (24.803 × 36.22 × 11.417 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8400 kN, C0 17900 kN, Pu 915 kN, grease limiting speed 270 r/min, oil 350 r/min, mass about 646000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/630BK30 mounts on a matching adapter or withdrawal sleeve on a plain 630 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/630BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/630BK30?",
        "a": "240/630BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/630BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8400 kN C / 17900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-630bk30",
      "240-630BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/630B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10700,
    "static_load_kN": 19900,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1050000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/630B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 630×1030×315 mm to ISO 15, with pressed-steel cage (standard execution). Numbering ties 231/630B to its envelope and execution: same-number EA versus EM or plain variants share the 630 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 231/630B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. With about 17.0 kN of C per millimetre of the 630 mm bore, 231/630B screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. Never mount 231/630B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1030 mm race.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 630 mm bore 231/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/630B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10700 kN rating no longer applies.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 630 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10700 kN rating no longer applies.",
      "The 10700/19900 kN ratings, 1190 kN Pu and 1050000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/630B?",
        "a": "231/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 315 mm width (24.803 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10700 kN, C0 19900 kN, Pu 1190 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1050000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/630BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/630B?",
        "a": "231/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10700 kN C / 19900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-630BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-630BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-630b",
      "231-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-630BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/630BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10700,
    "static_load_kN": 19900,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1020000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/630BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 630×1030×315 mm to ISO 15, with pressed-steel cage (standard execution). On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 231/630BK is assembled exactly in that order. The 200.0 mm radial section over the 630 mm bore carries two roller rows; capacity per millimetre of bore is about 17.0 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 1190 kN against C0 19900 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/630BK moves with cleanliness far more than with small C variations. Never mount 231/630BK by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1030 mm race.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 630 mm bore 231/630BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 315 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 10700 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 231/630BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 630×1030 mm envelope is identical.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 231/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 10700/19900 kN ratings, 1190 kN Pu and 1020000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/630BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/630BK?",
        "a": "231/630BK is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 315 mm width (24.803 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10700 kN, C0 19900 kN, Pu 1190 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1020000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/630BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/630BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/630BK?",
        "a": "231/630BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/630BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10700 kN C / 19900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-630bk",
      "231-630BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/630B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 400,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12900,
    "static_load_kN": 25000,
    "fatigue_load_limit_kN": 1200,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1330000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/630B belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Digit by digit the code reads as spherical-roller dimension series plus 630 mm bore; the 400 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Grease/oil ratio: the 250 r/min limiting value is .78 of the 320 r/min oil value; heavy 400 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Fillet radii on shaft and housing must clear the ring chamfers of the 400 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 630 mm bore 241/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 630 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 400 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/630B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 12900/25000 kN ratings, 1200 kN Pu and 1330000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/630B?",
        "a": "241/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 400 mm width (24.803 × 40.551 × 15.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12900 kN, C0 25000 kN, Pu 1200 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1330000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/630BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/630B?",
        "a": "241/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12900 kN C / 25000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-630BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-630BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-630b",
      "241-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-630BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/630BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1030,
    "B_mm": 400,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12900,
    "static_load_kN": 25000,
    "fatigue_load_limit_kN": 1200,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 1310000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/630BK30 is the basic execution of NTN's spherical roller range for a 630 mm shaft — 12900 kN basic dynamic capacity in a 1310000 g, open ISO 15 envelope. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 630 mm (two-digit code ×5, with the 00–03 exception table), and 1030 mm OD / 400 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Selection: the C0/C ratio of 1.94 (25000/12900 kN) reflects the heavy static and shock proportioning of 241/630BK30; size the equivalent load at the required L10 with shock factor for the application. Fillet radii on shaft and housing must clear the ring chamfers of the 400 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 630 mm bore 241/630BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 241/630BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 241/630B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 241/630BK30 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Never substitute 241/630BK30 by envelope alone: the 25000 kN C0 and 1200 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 12900/25000 kN ratings, 1200 kN Pu and 1310000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/630BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/630BK30?",
        "a": "241/630BK30 is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1030 mm OD and 400 mm width (24.803 × 40.551 × 15.748 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12900 kN, C0 25000 kN, Pu 1200 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 1310000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/630BK30 mounts on a matching adapter or withdrawal sleeve on a plain 630 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/630BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/630BK30?",
        "a": "241/630BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/630BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12900 kN C / 25000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-630bk30",
      "241-630BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-630B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/630B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1150,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15200,
    "static_load_kN": 26800,
    "fatigue_load_limit_kN": 1540,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1900000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 232/630B identifies a 630×1150×412 mm (24.803 × 45.276 × 16.22 in) spherical roller bearing, cylindrical bore, to the ISO 15 boundary plan. Reading the full code: the number gives the 630×1150 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Pu 1540 kN is the catalogue fatigue load limit for 232/630B, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 630 mm bore is 24.803 in and 1150 mm OD is 45.276 in; the ISO 15 envelope swaps between brands, but the 15200/26800 kN ratings and cage design are NTN 2203E values. Never mount 232/630B by striking the outer ring through the roller set; drive through ring faces (or the adapter sleeve nut) and support the ring square to avoid brinelling the 1150 mm race.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 630 mm bore 232/630B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Do not confuse EA and EM at the same number: 232/630B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 630×1150 mm envelope is identical.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 630 mm bearing, and drive-up procedures differ.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 15200/26800 kN ratings, 1540 kN Pu and 1900000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/630B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/630B?",
        "a": "232/630B is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1150 mm OD and 412 mm width (24.803 × 45.276 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15200 kN, C0 26800 kN, Pu 1540 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1900000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/630B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/630BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/630B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/630B?",
        "a": "232/630B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/630B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15200 kN C / 26800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-630BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-630BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-630b",
      "232-630B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-630BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/630BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 630,
    "D_mm": 1150,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 15200,
    "static_load_kN": 26800,
    "fatigue_load_limit_kN": 1540,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1840000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/630BK denotes the 630 mm bore spherical roller bearing (15200 kN C / 26800 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23200 series); the bore code resolves to 630 mm (two-digit code ×5, with the 00–03 exception table), and 1150 mm OD / 412 mm width follow the general plan. Pu 1540 kN is the catalogue fatigue load limit for 232/630BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Catalogue mass 1840000 g (1840.00 kg) for the 630×1150×412 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 232/630BK on its adapter or withdrawal sleeve on the 630 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 630 mm bore 232/630BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 232/630BK by envelope alone: the 26800 kN C0 and 1540 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/630BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 15200/26800 kN ratings, 1540 kN Pu and 1840000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/630BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/630BK?",
        "a": "232/630BK is an NTN double-row spherical roller bearing to ISO 15: 630 mm bore, 1150 mm OD and 412 mm width (24.803 × 45.276 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 15200 kN, C0 26800 kN, Pu 1540 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1840000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/630BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/630B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/630BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/630BK?",
        "a": "232/630BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/630BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 15200 kN C / 26800 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-630B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-630B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=215",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-630bk",
      "232-630BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-670",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/670",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 900,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4550,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 795,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "speed_oil_rpm": 390,
    "weight_g": 317000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/670 is the basic execution of NTN's spherical roller range for a 670 mm shaft — 4550 kN basic dynamic capacity in a 317000 g, open ISO 15 envelope. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 239/670 is assembled exactly in that order. Suffix reading on 239/670: the bare number is the standard open execution; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 239/670; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Fillet radii on shaft and housing must clear the ring chamfers of the 170 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 670 mm bore 239/670 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "Oil relubrication toward 390 r/min needs drain and level design; flooding the 170 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/670 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 170 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 4550/10300 kN ratings, 795 kN Pu and 317000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/670 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/670?",
        "a": "239/670 is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 900 mm OD and 170 mm width (26.378 × 35.433 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4550 kN, C0 10300 kN, Pu 795 kN, grease limiting speed 300 r/min, oil 390 r/min, mass about 317000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/670 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/670K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/670 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/670?",
        "a": "239/670 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/670 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4550 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-670K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-670K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-670"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-670K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/670K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 900,
    "B_mm": 170,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4550,
    "static_load_kN": 10300,
    "fatigue_load_limit_kN": 795,
    "limiting_speed_rpm": 300,
    "max_rpm": 300,
    "speed_oil_rpm": 390,
    "weight_g": 307000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/670K belongs to the 23900 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (K), lubrication feature (none); 239/670K is assembled exactly in that order. The 115.0 mm radial section over the 670 mm bore carries two roller rows; capacity per millimetre of bore is about 6.8 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 795 kN against C0 10300 kN anchors the contamination derating; for dirty mining duty the adjusted life of 239/670K moves with cleanliness far more than with small C variations. Mount 239/670K on its adapter or withdrawal sleeve on the 670 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 670 mm bore 239/670K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 239/670K carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 670×900 mm envelope is identical.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 170 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 300 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 239/670: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 4550/10300 kN ratings, 795 kN Pu and 307000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/670K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/670K?",
        "a": "239/670K is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 900 mm OD and 170 mm width (26.378 × 35.433 × 6.693 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4550 kN, C0 10300 kN, Pu 795 kN, grease limiting speed 300 r/min, oil 390 r/min, mass about 307000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/670K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/670."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/670K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/670K?",
        "a": "239/670K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/670K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4550 kN C / 10300 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-670",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-670 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-670k",
      "239-670K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/670B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 360,
    "weight_g": 594000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/670B is the basic execution of NTN's spherical roller range for a 670 mm shaft — 7300 kN basic dynamic capacity in a 594000 g, open ISO 15 envelope. Numbering ties 230/670B to its envelope and execution: same-number EA versus EM or plain variants share the 670 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Suffix reading on 230/670B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Selection: the C0/C ratio of 2.00 (14600/7300 kN) reflects the heavy static and shock proportioning of 230/670B; size the equivalent load at the required L10 with shock factor for the application. Fit the cylindrical-bore 230/670B with the inner ring heated (max 120 °C) for the shaft interference; the outer ring slides into the housing with its spherical seat able to pivot after seating.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 670 mm bore 230/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Do not confuse EA and EM at the same number: 230/670B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 670×980 mm envelope is identical.",
      "Oil relubrication toward 360 r/min needs drain and level design; flooding the 230 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 230 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 7300/14600 kN ratings, 1000 kN Pu and 594000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/670B?",
        "a": "230/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 230 mm width (26.378 × 38.583 × 9.055 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 14600 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 360 r/min, mass about 594000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/670BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/670B?",
        "a": "230/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 14600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-670BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-670BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-670b",
      "230-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-670BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/670BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 230,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 7300,
    "static_load_kN": 14600,
    "fatigue_load_limit_kN": 1000,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 360,
    "weight_g": 573000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "230/670BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 670×980×230 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 670×980 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Selection: the C0/C ratio of 2.00 (14600/7300 kN) reflects the heavy static and shock proportioning of 230/670BK; size the equivalent load at the required L10 with shock factor for the application. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 670 mm bore 230/670BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/670BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 230/670B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 670 mm bearing, and drive-up procedures differ.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 670 mm bearing, and drive-up procedures differ.",
      "The 7300/14600 kN ratings, 1000 kN Pu and 573000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/670BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/670BK?",
        "a": "230/670BK is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 230 mm width (26.378 × 38.583 × 9.055 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 7300 kN, C0 14600 kN, Pu 1000 kN, grease limiting speed 280 r/min, oil 360 r/min, mass about 573000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/670BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/670BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/670BK?",
        "a": "230/670BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/670BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 7300 kN C / 14600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-670bk",
      "230-670BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/670B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9650,
    "static_load_kN": 20600,
    "fatigue_load_limit_kN": 1040,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 794000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/670B with a cylindrical bore and plain outer ring (no D1/W33 groove): 670 mm bore, 980 mm OD, 308 mm width, rated 250 r/min on grease. Digit by digit the code reads as spherical-roller dimension series plus 670 mm bore; the 308 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The 155.0 mm radial section over the 670 mm bore carries two roller rows; capacity per millimetre of bore is about 14.4 kN/mm, among the highest of rolling bearings for the ISO 15 envelope. Pu 1040 kN against C0 20600 kN anchors the contamination derating; for dirty mining duty the adjusted life of 240/670B moves with cleanliness far more than with small C variations. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 670 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 670 mm bore 240/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9650 kN rating no longer applies.",
      "Oil relubrication toward 320 r/min needs drain and level design; flooding the 308 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The cylindrical-bore 240/670B and its tapered-bore counterpart 240/670BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The cylindrical-bore 240/670B and its tapered-bore counterpart 240/670BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The 9650/20600 kN ratings, 1040 kN Pu and 794000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/670B?",
        "a": "240/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 308 mm width (26.378 × 38.583 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9650 kN, C0 20600 kN, Pu 1040 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 794000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/670BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/670B?",
        "a": "240/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9650 kN C / 20600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-670BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-670BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-670b",
      "240-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-670BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/670BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 980,
    "B_mm": 308,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 9650,
    "static_load_kN": 20600,
    "fatigue_load_limit_kN": 1040,
    "limiting_speed_rpm": 250,
    "max_rpm": 250,
    "speed_oil_rpm": 320,
    "weight_g": 781000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "240/670BK30 belongs to the 24000 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Reading the full code: the number gives the 670×980 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 1040 kN is the catalogue fatigue load limit for 240/670BK30, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Grease/oil ratio: the 250 r/min limiting value is .78 of the 320 r/min oil value; heavy 308 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 670 mm bore 240/670BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 308 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/670B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 9650 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/670BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 9650/20600 kN ratings, 1040 kN Pu and 781000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/670BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/670BK30?",
        "a": "240/670BK30 is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 980 mm OD and 308 mm width (26.378 × 38.583 × 12.126 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 9650 kN, C0 20600 kN, Pu 1040 kN, grease limiting speed 250 r/min, oil 320 r/min, mass about 781000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/670BK30 mounts on a matching adapter or withdrawal sleeve on a plain 670 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/670BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/670BK30?",
        "a": "240/670BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/670BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 9650 kN C / 20600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-670bk30",
      "240-670BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/670B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12500,
    "static_load_kN": 23600,
    "fatigue_load_limit_kN": 1400,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1250000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/670B denotes the 670 mm bore spherical roller bearing (12500 kN C / 23600 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. Digit by digit the code reads as spherical-roller dimension series plus 670 mm bore; the 336 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. The cylindrical bore fits a machined 670 mm shaft seat directly; the same envelope in 231/670BK (tapered) is the sleeve-mounted alternative when clearance must be set by drive-up. Equivalent-load planning keeps a radial plus moderate axial combination on 231/670B; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 670 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "false brinelling on stopped machines exposed to screen or crusher vibration"
    ],
    "pitfalls": [
      "At 670 mm bore 231/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 300 r/min needs drain and level design; flooding the 336 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 12500 kN rating no longer applies.",
      "Do not confuse EA and EM at the same number: 231/670B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 670×1090 mm envelope is identical.",
      "The 12500/23600 kN ratings, 1400 kN Pu and 1250000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/670B?",
        "a": "231/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 336 mm width (26.378 × 42.913 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12500 kN, C0 23600 kN, Pu 1400 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1250000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/670BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/670B?",
        "a": "231/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12500 kN C / 23600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-670BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-670BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-670b",
      "231-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-670BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/670BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 336,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 12500,
    "static_load_kN": 23600,
    "fatigue_load_limit_kN": 1400,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1210000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "231/670BK belongs to the 23100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. Numbering ties 231/670BK to its envelope and execution: same-number EA versus EM or plain variants share the 670 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 12500 kN C and 1210000 g mass the 23100 series part is built for shock and vibration; the 336 mm-wide ring needs square abutments to keep both rows equally loaded. Pu 1400 kN against C0 23600 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/670BK moves with cleanliness far more than with small C variations. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 231/670BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "water-induced pitting in washdown or outdoor duty without effective external seals",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 670 mm bore 231/670BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/670BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/670BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 12500/23600 kN ratings, 1400 kN Pu and 1210000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/670BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/670BK?",
        "a": "231/670BK is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 336 mm width (26.378 × 42.913 × 13.228 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 12500 kN, C0 23600 kN, Pu 1400 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1210000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/670BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/670BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/670BK?",
        "a": "231/670BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/670BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 12500 kN C / 23600 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-670bk",
      "231-670BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/670B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14100,
    "static_load_kN": 28000,
    "fatigue_load_limit_kN": 1340,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1530000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 241/670B with a cylindrical bore and plain outer ring (no D1/W33 groove): 670 mm bore, 1090 mm OD, 412 mm width, rated 230 r/min on grease. On the NTN nameplate the suffix cluster after the size reads in order: cage design (—), bore (cylindrical), lubrication feature (none); 241/670B is assembled exactly in that order. Two symmetric roller rows share the load: C 14100 kN, C0 28000 kN (C0/C ≈ 1.99), with useful axial capacity in either direction alongside the dominant radial load. Selection: the C0/C ratio of 1.99 (28000/14100 kN) reflects the heavy static and shock proportioning of 241/670B; size the equivalent load at the required L10 with shock factor for the application. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 670 mm set.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "hard-particle indentation through the open arrangement in dusty mining duty"
    ],
    "pitfalls": [
      "At 670 mm bore 241/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 241/670B by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 241/670B and its tapered-bore counterpart 241/670BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Never substitute 241/670B by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 14100/28000 kN ratings, 1340 kN Pu and 1530000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/670B?",
        "a": "241/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 412 mm width (26.378 × 42.913 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14100 kN, C0 28000 kN, Pu 1340 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1530000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/670BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/670B?",
        "a": "241/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14100 kN C / 28000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-670BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-670BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-670b",
      "241-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-670BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/670BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1090,
    "B_mm": 412,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 14100,
    "static_load_kN": 28000,
    "fatigue_load_limit_kN": 1340,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 1510000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/670BK30 belongs to the 24100 series of NTN spherical rollers: self-aligning, high radial capacity, moderate axial load in either direction. The leading digits are the ISO 15 dimension series (24100 series); the bore code resolves to 670 mm (two-digit code ×5, with the 00–03 exception table), and 1090 mm OD / 412 mm width follow the general plan. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Grease/oil ratio: the 230 r/min limiting value is .77 of the 300 r/min oil value; heavy 412 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 670 mm bore 241/670BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 412 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 241/670BK30 by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 241/670BK30 by envelope alone: the 28000 kN C0 and 1340 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 14100/28000 kN ratings, 1340 kN Pu and 1510000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/670BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/670BK30?",
        "a": "241/670BK30 is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1090 mm OD and 412 mm width (26.378 × 42.913 × 16.22 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 14100 kN, C0 28000 kN, Pu 1340 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 1510000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/670BK30 mounts on a matching adapter or withdrawal sleeve on a plain 670 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/670BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/670BK30?",
        "a": "241/670BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/670BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 14100 kN C / 28000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-670bk30",
      "241-670BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-670B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/670B",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1220,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17900,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1770,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 2270000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 232/670B denotes the 670 mm bore spherical roller bearing (17900 kN C / 32000 kN C0) in the 23200 series, the self-aligning choice for heavy combined load. Numbering ties 232/670B to its envelope and execution: same-number EA versus EM or plain variants share the 670 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Open by design, 232/670B requires application seals and a grease or oil system; NTN vibrating-duty executions of this envelope are selected with cage and clearance choices that are separate order codes. The 275.0 mm section height hosts the spherical roller geometry; shaft and housing fillet radii must clear the chamfer table so the 438 mm-wide ring seats fully on both sides. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 670 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient"
    ],
    "pitfalls": [
      "At 670 mm bore 232/670B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 232/670B by envelope alone: the 32000 kN C0 and 1770 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Oil relubrication toward 280 r/min needs drain and level design; flooding the 438 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 232/670B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 17900 kN rating no longer applies.",
      "The 17900/32000 kN ratings, 1770 kN Pu and 2270000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/670B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/670B?",
        "a": "232/670B is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1220 mm OD and 438 mm width (26.378 × 48.031 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17900 kN, C0 32000 kN, Pu 1770 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 2270000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "232/670B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 232/670BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/670B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/670B?",
        "a": "232/670B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/670B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17900 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-670BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 232-670BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-670b",
      "232-670B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "232-670BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 232/670BK",
    "series": "23200-series",
    "type": "spherical_roller",
    "d_mm": 670,
    "D_mm": 1220,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 17900,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1770,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 2200000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "232/670BK is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 670×1220×438 mm to ISO 15, with pressed-steel cage (standard execution). Digit by digit the code reads as spherical-roller dimension series plus 670 mm bore; the 438 mm width is the wide ISO 15 section, which is why spherical rollers interchange dimensionally but not in cage or rating detail. Pu 1770 kN is the catalogue fatigue load limit for 232/670BK, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. With about 26.7 kN of C per millimetre of the 670 mm bore, 232/670BK screens interchange candidates quickly — then verify cage (EA/EM), bore (K/K30) and lubrication feature (D1/W33) suffixes. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 232/670BK leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 670 mm bore 232/670BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 670 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "The 1:12 tapered bore is the only difference from the cylindrical-bore 232/670B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Self-aligning does not mean unlimited misalignment: beyond the catalogue angle the outer ring's spherical travel is exhausted and the 17900 kN rating no longer applies.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 232/670BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 17900/32000 kN ratings, 1770 kN Pu and 2200000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 232/670BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 232/670BK?",
        "a": "232/670BK is an NTN double-row spherical roller bearing to ISO 15: 670 mm bore, 1220 mm OD and 438 mm width (26.378 × 48.031 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 17900 kN, C0 32000 kN, Pu 1770 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 2200000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 232/670BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 232/670B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 232/670BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 232/670BK?",
        "a": "232/670BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 232/670BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23200 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 17900 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "232-670B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23200-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 232-670B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "232-670bk",
      "232-670BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-710",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/710",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 950,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 11500,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 375000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "239/710 is the basic execution of NTN's spherical roller range for a 710 mm shaft — 4950 kN basic dynamic capacity in a 375000 g, open ISO 15 envelope. Numbering ties 239/710 to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. Pu 665 kN is the catalogue fatigue load limit for 239/710, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. 710 mm bore is 27.953 in and 950 mm OD is 37.402 in; the ISO 15 envelope swaps between brands, but the 4950/11500 kN ratings and cage design are NTN 2203E values. Supply grease through the outer-ring feature during commissioning and at the calculated interval, rotating the 710 mm bore assembly by hand to distribute it across both rows.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 710 mm bore 239/710 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 239/710 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×950 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 239/710 on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "Oil relubrication toward 370 r/min needs drain and level design; flooding the 180 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/710 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 4950/11500 kN ratings, 665 kN Pu and 375000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/710 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/710?",
        "a": "239/710 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 950 mm OD and 180 mm width (27.953 × 37.402 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 11500 kN, Pu 665 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 375000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "239/710 has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 239/710K (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/710 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/710?",
        "a": "239/710 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/710 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 11500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-710K",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 239-710K (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-710"
    ],
    "locale_variants": {}
  },
  {
    "sku": "239-710K",
    "brand": "NTN",
    "manufacturer_designation": "NTN 239/710K",
    "series": "23900-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 950,
    "B_mm": 180,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 4950,
    "static_load_kN": 11500,
    "fatigue_load_limit_kN": 665,
    "limiting_speed_rpm": 280,
    "max_rpm": 280,
    "speed_oil_rpm": 370,
    "weight_g": 363000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 710 mm shaft, NTN supplies 239/710K: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 370 r/min. Reading the full code: the number gives the 710×950 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Pu 665 kN is the catalogue fatigue load limit for 239/710K, used in the adjusted-life equation at contaminated or partial-film conditions typical of mining and vibrating duty. Grease/oil ratio: the 280 r/min limiting value is .76 of the 370 r/min oil value; heavy 180 mm-wide cages run hot in churning grease, so quantity and groove supply both matter. After mounting on a tapered seat, lock the nut and re-check clearance after a short running-in period, because sleeve seating and ring lift-off can change the residual clearance of the 710 mm set.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "brinelling from static overload or a hammer blow during sleeve mounting",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 710 mm bore 239/710K is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 180 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Never substitute 239/710K by envelope alone: the 11500 kN C0 and 665 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Never substitute 239/710K by envelope alone: the 11500 kN C0 and 665 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 239/710K in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 4950/11500 kN ratings, 665 kN Pu and 363000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 239/710K (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 239/710K?",
        "a": "239/710K is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 950 mm OD and 180 mm width (27.953 × 37.402 × 7.087 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 4950 kN, C0 11500 kN, Pu 665 kN, grease limiting speed 280 r/min, oil 370 r/min, mass about 363000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 239/710K mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 239/710."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 239/710K is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 239/710K?",
        "a": "239/710K is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 239/710K take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23900 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 4950 kN C / 11500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "239-710",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23900-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 239-710 — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "239-710k",
      "239-710K"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/710B",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8000,
    "static_load_kN": 16200,
    "fatigue_load_limit_kN": 1140,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 663000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 230/710B denotes the 710 mm bore spherical roller bearing (8000 kN C / 16200 kN C0) in the 23000 series, the self-aligning choice for heavy combined load. Reading the full code: the number gives the 710×1030 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. The bearing accepts predominantly radial load with a moderate axial share, but is not a pure thrust bearing: sustained axial-only load skids the unloaded row and damages the basic cage. Speed planning: 260 r/min grease limiting speed is the cage/kinematic ceiling and 340 r/min is the oil-lubricated value for the 710 mm bore; vibrating screens rarely approach either and are load/cage limited instead. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 230/710B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "brinelling from static overload or a hammer blow during sleeve mounting"
    ],
    "pitfalls": [
      "At 710 mm bore 230/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Never substitute 230/710B by envelope alone: the 16200 kN C0 and 1140 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The 8000/16200 kN ratings, 1140 kN Pu and 663000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/710B?",
        "a": "230/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 236 mm width (27.953 × 40.551 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8000 kN, C0 16200 kN, Pu 1140 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 663000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "230/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 230/710BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/710B?",
        "a": "230/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8000 kN C / 16200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-710BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 230-710BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-710b",
      "230-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "230-710BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 230/710BK",
    "series": "23000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 236,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 8000,
    "static_load_kN": 16200,
    "fatigue_load_limit_kN": 1140,
    "limiting_speed_rpm": 260,
    "max_rpm": 260,
    "speed_oil_rpm": 340,
    "weight_g": 640000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 710 mm shaft, NTN supplies 230/710BK: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 340 r/min. The leading digits are the ISO 15 dimension series (23000 series); the bore code resolves to 710 mm (two-digit code ×5, with the 00–03 exception table), and 1030 mm OD / 236 mm width follow the general plan. NTN prints two speeds for 230/710BK: 260 r/min grease and 340 r/min oil — the gap of 80 r/min reflects oil cooling of the heavy roller set. 710 mm bore is 27.953 in and 1030 mm OD is 40.551 in; the ISO 15 envelope swaps between brands, but the 8000/16200 kN ratings and cage design are NTN 2203E values. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 710 mm bore 230/710BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Do not confuse EA and EM at the same number: 230/710BK carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×1030 mm envelope is identical.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 230/710BK on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "Oil relubrication toward 340 r/min needs drain and level design; flooding the 236 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The 8000/16200 kN ratings, 1140 kN Pu and 640000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 230/710BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 230/710BK?",
        "a": "230/710BK is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 236 mm width (27.953 × 40.551 × 9.291 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 8000 kN, C0 16200 kN, Pu 1140 kN, grease limiting speed 260 r/min, oil 340 r/min, mass about 640000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 230/710BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 230/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 230/710BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 230/710BK?",
        "a": "230/710BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 230/710BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 8000 kN C / 16200 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "230-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23000-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 230-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "230-710bk",
      "230-710BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/710B",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10300,
    "static_load_kN": 22500,
    "fatigue_load_limit_kN": 1150,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 884000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/710B with a cylindrical bore and plain outer ring (no D1/W33 groove): 710 mm bore, 1030 mm OD, 315 mm width, rated 230 r/min on grease. Numbering ties 240/710B to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. The plain outer ring (no D1/W33 groove) makes relubrication part of the design: fresh grease reaches the rolling elements through the outer-ring feature rather than relying solely on end-side packing. Catalogue mass 884000 g (884.00 kg) for the 710×1030×315 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. On vibrating-duty shafts verify the radial clearance class and cage choice at order time; the open 240/710B leaves sealing and the C3/C4 clearance decision to the application drawing.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "hard-particle indentation through the open arrangement in dusty mining duty",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 710 mm bore 240/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 240/710B by envelope alone: the 22500 kN C0 and 1150 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "Do not confuse EA and EM at the same number: 240/710B carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×1030 mm envelope is identical.",
      "The cylindrical-bore 240/710B and its tapered-bore counterpart 240/710BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "The 10300/22500 kN ratings, 1150 kN Pu and 884000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/710B?",
        "a": "240/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 315 mm width (27.953 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10300 kN, C0 22500 kN, Pu 1150 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 884000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "240/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 240/710BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/710B?",
        "a": "240/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10300 kN C / 22500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-710BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 240-710BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-710b",
      "240-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "240-710BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 240/710BK30",
    "series": "24000-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1030,
    "B_mm": 315,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 10300,
    "static_load_kN": 22500,
    "fatigue_load_limit_kN": 1150,
    "limiting_speed_rpm": 230,
    "max_rpm": 230,
    "speed_oil_rpm": 300,
    "weight_g": 870000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "NTN lists 240/710BK30 with a 1:30 tapered bore (K30) and plain outer ring (no D1/W33 groove): 710 mm bore, 1030 mm OD, 315 mm width, rated 230 r/min on grease. Numbering ties 240/710BK30 to its envelope and execution: same-number EA versus EM or plain variants share the 710 mm bore but differ in cage and sometimes mass, so they are quoted as separate articles. At 10300 kN C and 870000 g mass the 24000 series part is built for shock and vibration; the 315 mm-wide ring needs square abutments to keep both rows equally loaded. Catalogue mass 870000 g (870.00 kg) for the 710×1030×315 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Mount 240/710BK30 on its adapter or withdrawal sleeve on the 710 mm plain shaft: oil the sleeve, fit the lock nut, drive up to the NTN-specified residual clearance (or use oil injection on large seats), then lock the tab washer.",
    "applications": [
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "fretting corrosion between adapter sleeve and tapered bore when the drive-up is insufficient",
      "rolling-contact fatigue after the catalogue L10 life at the actual load"
    ],
    "pitfalls": [
      "At 710 mm bore 240/710BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 240/710BK30 in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 240/710B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Oil relubrication toward 300 r/min needs drain and level design; flooding the 315 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "Open spherical rollers swallow dust in mining duty; specify labyrinth or taconite seals externally, or the 230 r/min grease rating is lost to abrasive wear long before fatigue.",
      "The 10300/22500 kN ratings, 1150 kN Pu and 870000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 240/710BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 240/710BK30?",
        "a": "240/710BK30 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1030 mm OD and 315 mm width (27.953 × 40.551 × 12.402 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 10300 kN, C0 22500 kN, Pu 1150 kN, grease limiting speed 230 r/min, oil 300 r/min, mass about 870000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24000 series). 240/710BK30 mounts on a matching adapter or withdrawal sleeve on a plain 710 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 240/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 240/710BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 240/710BK30?",
        "a": "240/710BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 240/710BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24000 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 10300 kN C / 22500 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "240-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24000-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 240-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "240-710bk30",
      "240-710BK30"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/710B",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13000,
    "static_load_kN": 24900,
    "fatigue_load_limit_kN": 1470,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1420000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "In NTN Ball and Roller Bearings CAT.No.2203E, 231/710B denotes the 710 mm bore spherical roller bearing (13000 kN C / 24900 kN C0) in the 23100 series, the self-aligning choice for heavy combined load. The leading digits are the ISO 15 dimension series (23100 series); the bore code resolves to 710 mm (two-digit code ×5, with the 00–03 exception table), and 1150 mm OD / 345 mm width follow the general plan. The sphered outer raceway lets the inner-ring assembly pivot, accommodating shaft deflection and housing misalignment (around 1–2° for this class; use the 2203E value for the exact series) without edge loading the rollers. Pu 1470 kN against C0 24900 kN anchors the contamination derating; for dirty mining duty the adjusted life of 231/710B moves with cleanliness far more than with small C variations. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "micro-pitting when the EHL film is thinner than the raceway composite roughness",
      "false brinelling on stopped machines exposed to screen or crusher vibration",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 710 mm bore 231/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "Never substitute 231/710B by envelope alone: the 24900 kN C0 and 1470 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The cylindrical-bore 231/710B and its tapered-bore counterpart 231/710BK share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/710B in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "Minimum load must be maintained even at rest under vibration: an unloaded 231/710B on a stopped screen false-brinells; parking brakes and shaker isolation both matter.",
      "The 13000/24900 kN ratings, 1470 kN Pu and 1420000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/710B?",
        "a": "231/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 345 mm width (27.953 × 45.276 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13000 kN, C0 24900 kN, Pu 1470 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1420000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "231/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 231/710BK (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/710B?",
        "a": "231/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13000 kN C / 24900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-710BK",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 231-710BK (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-710b",
      "231-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "231-710BK",
    "brand": "NTN",
    "manufacturer_designation": "NTN 231/710BK",
    "series": "23100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 345,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 13000,
    "static_load_kN": 24900,
    "fatigue_load_limit_kN": 1470,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1380000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "The NTN order number 231/710BK identifies a 710×1150×345 mm (27.953 × 45.276 × 13.583 in) spherical roller bearing, 1:12 tapered bore (K), to the ISO 15 boundary plan. Reading the full code: the number gives the 710×1150 mm envelope, — names the cage/capacity execution, K marks the 1:12 tapered bore for adapter/withdrawal-sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 231/710BK: the bare number is the standard open execution; K marks the 1:12 tapered bore; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Equivalent-load planning keeps a radial plus moderate axial combination on 231/710BK; if the axial component dominates, pair with a thrust bearing rather than running one roller row unloaded. Check the self-aligning movement after fitting: the housing should pivot freely around the sphered outer raceway; a pinched outer ring removes the alignment capacity the bearing was selected for.",
    "applications": [
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls",
      "large SAG/ball-mill trunnion and pinion shafts"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "cage damage when a mounting force is applied through the roller set instead of the ring face",
      "sliding wear and heat when relubrication intervals ignore the groove (D1/W33) supply path",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "water-induced pitting in washdown or outdoor duty without effective external seals"
    ],
    "pitfalls": [
      "At 710 mm bore 231/710BK is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 345 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "Oil relubrication toward 280 r/min needs drain and level design; flooding the 345 mm cavity churns heat through the heavy roller set and cage despite the higher oil speed figure.",
      "The D1/W33 groove only helps if the housing has a matching grease passage; mounting a grooved 231/710BK in a solid block with no port wastes the feature and leaves the centre rows under-lubricated.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 345 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 13000/24900 kN ratings, 1470 kN Pu and 1380000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 231/710BK (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 231/710BK?",
        "a": "231/710BK is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 345 mm width (27.953 × 45.276 × 13.583 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 13000 kN, C0 24900 kN, Pu 1470 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1380000 g. It is open, with pressed-steel cage (standard execution) and a 1:12 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K denotes a 1:12 tapered bore. 231/710BK mounts on an adapter sleeve (or tapered shaft seat) and is driven up to the specified residual clearance; its cylindrical-bore counterpart in the same envelope and ratings is 231/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 231/710BK is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 231/710BK?",
        "a": "231/710BK is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 231/710BK take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 23100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 13000 kN C / 24900 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "231-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 23100-series envelope, cage and ratings; this is the tapered-bore execution (K, 1:12) of the cylindrical-bore 231-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "231-710bk",
      "231-710BK"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-710B",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/710B",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16100,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1800000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "241/710B is an NTN double-row spherical roller bearing: two rows of symmetric rollers on a sphered outer raceway, 710×1150×438 mm to ISO 15, with pressed-steel cage (standard execution). Reading the full code: the number gives the 710×1150 mm envelope, — names the cage/capacity execution, no bore suffix means cylindrical bore for a direct shaft seat, and plain outer ring (no D1/W33 groove) completes the order number. Suffix reading on 241/710B: the bare number is the standard open execution; B marks the standard large-bore internal design on slash-size 230–232 series; quote the full code because each suffix is a distinct article. Catalogue mass 1800000 g (1800.00 kg) for the 710×1150×438 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 438 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large SAG/ball-mill trunnion and pinion shafts",
      "heavy vibrating screens and grizzly feeders",
      "offshore and marine propulsion shaftlines",
      "large wind-turbine main-shaft arrangements"
    ],
    "failure_modes": [
      "raceway spalling at the roller ends when misalignment or deflection concentrates the line contact",
      "machined EM cage wear from inadequate oil film at the cage-guiding surfaces",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "rolling-contact fatigue after the catalogue L10 life at the actual load",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 710 mm bore 241/710B is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "The cylindrical-bore 241/710B and its tapered-bore counterpart 241/710BK30 share envelope and ratings but not mounting: do not order the K variant unless the drawing specifies a sleeve or tapered seat.",
      "Adapter-sleeve mounting requires the correct sleeve series and locknut for the 710 mm shaft; a sleeve sized to bore alone ignores thread, width and the oil-injection option on large K30 seats.",
      "Never substitute 241/710B by envelope alone: the 32000 kN C0 and 1190 kN Pu are specific to the NTN basic execution, and vibrating duty depends heavily on cage identity.",
      "The two roller rows must share load equally — a tilted spacer or unequal abutment on the 438 mm-wide ring loads one row only and shows as asymmetric race polish during inspection.",
      "The 16100/32000 kN ratings, 1190 kN Pu and 1800000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/710B (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/710B?",
        "a": "241/710B is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 438 mm width (27.953 × 45.276 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16100 kN, C0 32000 kN, Pu 1190 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1800000 g. It is open, with pressed-steel cage (standard execution)."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "241/710B has a cylindrical bore and mounts directly on a machined shaft seat. Its tapered-bore counterpart is 241/710BK30 (K = 1:12, or K30 = 1:30 on the wide series), intended for adapter/withdrawal-sleeve mounting."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/710B is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/710B?",
        "a": "241/710B is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/710B take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16100 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-710BK30",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the cylindrical-bore execution of the tapered-bore 241-710BK30 (K/K30 sleeve or tapered-seat mounting). Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-710b",
      "241-710B"
    ],
    "locale_variants": {}
  },
  {
    "sku": "241-710BK30",
    "brand": "NTN",
    "manufacturer_designation": "NTN 241/710BK30",
    "series": "24100-series",
    "type": "spherical_roller",
    "d_mm": 710,
    "D_mm": 1150,
    "B_mm": 438,
    "material": "GCr15",
    "seal_type": "open",
    "clearance": "CN",
    "tolerance_class": "P0",
    "cage_type": "steel",
    "dynamic_load_kN": 16100,
    "static_load_kN": 32000,
    "fatigue_load_limit_kN": 1190,
    "limiting_speed_rpm": 220,
    "max_rpm": 220,
    "speed_oil_rpm": 280,
    "weight_g": 1770000,
    "weight_estimated": false,
    "temp_min_c": -40,
    "temp_max_c": 120,
    "standard": "ISO 15",
    "naming_rule_text": "For heavy radial load with misalignment on a 710 mm shaft, NTN supplies 241/710BK30: sphered outer raceway, two roller rows, pressed-steel cage (standard execution), oil speed 280 r/min. Reading the full code: the number gives the 710×1150 mm envelope, — names the cage/capacity execution, K30 marks the 1:30 tapered bore for sleeve mounting, and plain outer ring (no D1/W33 groove) completes the order number. The 1:30 tapered bore mounts on an adapter/withdrawal sleeve (or tapered seat); drive-up sets the residual radial clearance and fixes the axial position of the 710 mm bore assembly. Catalogue mass 1770000 g (1770.00 kg) for the 710×1150×438 mm execution includes the basic cage and both roller rows; shaft and housing shoulders must support that ring squarely. Fillet radii on shaft and housing must clear the ring chamfers of the 438 mm-wide set; use the NTN shoulder/withdrawal-groove table rather than copying a ball-bearing layout.",
    "applications": [
      "large wind-turbine main-shaft arrangements",
      "steel-mill and heavy crusher main shafts",
      "mining shovel and dragline swing shafts",
      "cement-rotary-kiln support and trunnion rolls"
    ],
    "failure_modes": [
      "lubricant starvation at the centre rib area when the D1/W33 groove is not connected to a relubrication supply",
      "pressed EA cage fatigue under sustained vibration when minimum load is not maintained",
      "roller-end smearing during skidding starts under light load and high viscosity grease",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range",
      "asymmetric wear on the two roller rows from sustained angular misalignment beyond the self-aligning range"
    ],
    "pitfalls": [
      "At 710 mm bore 241/710BK30 is normally mounted on adapter/withdrawal sleeves with hydraulic assistance; follow the NTN drive-up angle or oil-injection procedure — manual nut tightening cannot set the multi-tonne seating correctly.",
      "K and K30 are different tapers — K is 1:12 and K30 is 1:30 on the wide series; an adapter sleeve for one will not mount the other 710 mm bearing, and drive-up procedures differ.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 241/710B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "The 1:30 tapered bore is the only difference from the cylindrical-bore 241/710B: envelopes and ratings match, but drive-up tooling, sleeve and seat do not — never mix the two mounting methods.",
      "Do not confuse EA and EM at the same number: 241/710BK30 carries basic; swapping to the other cage execution changes mass, speed behaviour and sometimes suitability for vibration, even though the 710×1150 mm envelope is identical.",
      "The 16100/32000 kN ratings, 1190 kN Pu and 1770000 g mass are NTN Ball and Roller Bearings CAT.No.2203E values for 241/710BK30 (basic); another maker's same-envelope part revises internal geometry, so re-verify ratings and cage before substitution on vibrating or rated drives."
    ],
    "faq": [
      {
        "q": "What are the dimensions and catalogue data of 241/710BK30?",
        "a": "241/710BK30 is an NTN double-row spherical roller bearing to ISO 15: 710 mm bore, 1150 mm OD and 438 mm width (27.953 × 45.276 × 17.244 in). From NTN Ball and Roller Bearings CAT.No.2203E: C 16100 kN, C0 32000 kN, Pu 1190 kN, grease limiting speed 220 r/min, oil 280 r/min, mass about 1770000 g. It is open, with pressed-steel cage (standard execution) and a 1:30 tapered bore."
      },
      {
        "q": "What is the difference between the K/K30 tapered bore and the cylindrical bore versions?",
        "a": "K30 denotes a 1:30 tapered bore (the wide 24100 series). 241/710BK30 mounts on a matching adapter or withdrawal sleeve on a plain 710 mm shaft and is driven up to a measured radial clearance; the cylindrical-bore counterpart is 241/710B."
      },
      {
        "q": "What do EA and EM mean on NTN spherical roller bearings?",
        "a": "EA is the NTN standard-capacity/high-capacity execution with a pressed sheet-steel window cage; EM is the high-capacity execution with a one-piece machined brass cage. Both use the optimised symmetric-roller design, but cage identity changes mass, speed behaviour and suitability for duties like vibrating screens, so they are separate order numbers. 241/710BK30 is the basic execution."
      },
      {
        "q": "What do D1 and W33 mean on 241/710BK30?",
        "a": "241/710BK30 is listed without a D1/W33 outer-ring groove in 2203E; lubrication is supplied from the ring sides. D1 (NTN spelling) and W33 add the annular groove plus holes and are ordered as distinct suffixed executions of the same envelope."
      },
      {
        "q": "How much misalignment and axial load can 241/710BK30 take?",
        "a": "The sphered outer raceway compensates static and dynamic misalignment in the order of 1–2° (verify the exact 2203E figure for the 24100 series); beyond that, load concentrates on one roller row. Load is predominantly radial with a moderate axial share in either direction — 16100 kN C / 32000 kN C0 — but sustained pure axial load is not recommended because it unloads one row."
      }
    ],
    "cross_ref": [
      {
        "equiv_sku": "241-710B",
        "equiv_brand": "NTN",
        "level": "partial",
        "note": "Same NTN 24100-series envelope, cage and ratings; this is the tapered-bore execution (K30, 1:30) of the cylindrical-bore 241-710B — mounting (adapter/withdrawal sleeve or tapered seat, drive-up) differs. Verify shaft arrangement."
      }
    ],
    "source_ref": "https://www.ntnglobal.com/en/products/catalog/pdf/ntn_ball_roller_2203E.pdf#page=216",
    "catalog_ver": "NTN Ball and Roller Bearings CAT.No.2203E",
    "extracted_at": "2026-10-01",
    "last_verified": "2026-10-01",
    "confidence_score": 0.7,
    "status": "published",
    "aliases": [
      "241-710bk30",
      "241-710BK30"
    ],
    "locale_variants": {}
  }
]